Home
Search results “Not exists oracle sql”
EXIST Function in SQL
 
08:04
Join Discussion: http://www.techtud.com/video-lecture/exist-function-sql IMPORTANT LINKS: 1) Official Website: http://www.techtud.com/ 2) Virtual GATE: http://virtualgate.in/login/index.php Both of the above mentioned platforms are COMPLETELY FREE, so feel free to Explore, Learn, Practice & Share! Our Social Media Links: Facebook Page: https://www.facebook.com/techtuduniversity Facebook Group: https://www.facebook.com/groups/virtualgate Google+ Page: https://plus.google.com/+techtud/posts Last but not the least, SUBSCRIBE our YouTube channel to stay updated about the regularly uploaded new videos.
Views: 37954 Techtud
How to use exists statement
 
03:30
Hello Friends In this video i'm going to show you how to use exist in subquery step by step. #exists #oracletutorial #sql
Views: 6354 OCP Technology
IN VS EXISTS VS JOIN, performance
 
05:04
This video demonstrates the performance effects of using an exists clause instead of an IN clause, also it shows how we can update a simple sub query having an IN clause with an EXISTS or JOIN statement. It also shows that joining would consider the null data, where as an IN clause would neglect null values. If you want more such videos of exciting and amazing 'difference between' concepts, check out the links below : union and union all : https://youtu.be/n9FqQOd8liY char and varchar2 : https://youtu.be/039qzwjWf4k replace and translate : https://youtu.be/HKYF77BGzOE procedure and function : https://youtu.be/q3LmOenL120 rank and dense_rank : https://youtu.be/WGSX998hZ9M delete and truncate : https://youtu.be/u76wMm2byXo %type and %rowtype : https://youtu.be/MlLUFeZ_3eM
Views: 12622 Kishan Mashru
The SQL EXISTS clause
 
08:52
How to use the EXISTS clause in SQL. For beginners.
Views: 23965 Database by Doug
Let's Learn SQL! Lesson 82 : EXIST and NOT EXIST Subqueries
 
03:37
Explore SQL with Tom Coffing of Coffing Data Warehousing! In this lesson, learn about EXIST and NOT EXIST Subqueries!
Урок 27. SQL. Подзапрос EXISTS
 
06:54
Oracle SQL.Подзапрос EXISTS является наиболее сложным типом подзапроса в SQL. Но мы попробуем разобраться, здесь очень важно Осознать, что подзапрос EXIST Является предикатом, возвращает нам либо истину либо ложь, то есть в подзапрос EXIST это критерий того, будет на экран выведена данная строка либо нет. Также подзапрос EXISTS подразумевает внешнее объединение то есть внутренний подзапрос связывается определённым отношением с внешним запросом учебная среда https://apex.oracle.com/pls/apex/ схема: SQLADV польз: student1 пароль: student1 будут работать (student2/ student2, student3/ student3 .... student11/ student11) меню SQL Workshop , SQL Command или используйте http://sqlfiddle.com/ скрипт бд для загрузки в sqlfiddle http://sqladv.ru/dev/sql.txt урок и задания http://sqladv.ru/dev/sqlbasic/l27.txt
SQL Error ORA-00942 Table or View Does Not Exist in Oracle Database
 
05:03
How to use Tab View (Data Dictionary) of Oracle Database to solve the SQL Error ORA-00942 Table or View Does Not Exist error in Oracle Database ------------------------------------------------------------------------ ►►►LINKS◄◄◄ Blog: http://bit.ly/ora-00942 Previous Tutorial ► ------------------------------------------------------------------------- ►Make sure you SUBSCRIBE and be the 1st one to see my videos! ------------------------------------------------------------------------- ►►►Find me on Social Media◄◄◄ Follow What I am up to as it happens on https://twitter.com/rebellionrider http://instagram.com/rebellionrider https://plus.google.com/+Rebellionrider http://in.linkedin.com/in/mannbhardwaj/ ___Facebook Official Page of Manish Sharma___ https://www.facebook.com/TheRebellionRider/ ___Facebook Official Page of RebellionRider.com___ https://www.facebook.com/RebellionRider.official/ You can also Email me at for E-mail address please check the About section Please please LIKE and SHARE my videos it makes me happy. Thanks for liking, commenting, sharing and watching more of our videos This is Manish from RebellionRider.com ♥ I LOVE ALL MY VIEWERS AND SUBSCRIBERS
Views: 7638 Manish Sharma
095- Oracle SQL 12c: Correlated Subquery / Exists /not exists
 
12:54
تعلم اوراكل حتى الاحتراف EXAM 1Z0-061 EXAM 1Z0-071
Views: 1894 khaled alkhudari
SQL EXISTS VE NOT EXISTS KULLANIMI
 
05:49
SQL: EXISTS Condition This SQL tutorial explains how to use the SQL EXISTS condition with syntax and examples. Click the Try It button next to an example to test it for yourself in our SQL Editor. Description The SQL EXISTS condition is used in combination with a subquery and is considered to be met, if the subquery returns at least one row. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.
Views: 71 gracia heys
35. SQL EXISTS, how EXISTS differ from IN
 
18:49
The SQL EXISTS clause How to use the EXISTS clause in SQL. For beginners. How to use exists statement Hello Friends In this video i'm going to show you how to use exist in subquery step by step.
Views: 966 ProSchool
Oracle da SQL asoslari 34 NOT IN, NOT EXISTS
 
03:25
Darslar rivojiga hissa qo'shishni istovchilar uchun PayMe: 8600 1309 2342 8959 WEB MONEY ID: Z193564615070 yoki R769659687039
exists and not exists in SQL
 
04:38
Explaining usage of exists and not exists
SQL  subqueries - Lesson 8 (EXISTS, NOT EXISTS, ALL, ANY)
 
41:55
Subqueries are nested queries with another main query. Learn how to use subqueries as part of main queries and with aggregate functions using EXISTS | NOT EXISTS, ANY | ALL Links to all SQL Lessons: SQL Lesson 8 - Subqueries https://youtu.be/7DxuPcx-mRI SQL Lesson 6 - JOIN (INNER, LEFT, RIGHT) https://youtu.be/_NrRRzCjFGE SQL Lesson 5 - Constraints (Default, Primary Key, Foreign Key …) https://youtu.be/BtmHISzqYjQ SQL Lesson 4 - GROUP BY, HAVING, String Functions https://youtu.be/zClzY2fE2fA SQL Lesson 3 - Aggregate Functions SUM, AVG etc. https://youtu.be/w1F0UgsYfis SQL Lesson 2 - Logical, Conditional and Arithmetic Operators https://youtu.be/OpRO1atoe84 SQL Lesson 1 - Basics of SQL Queries https://youtu.be/pJCyTBkoIKA
Views: 336 masti supreme
Oracle Sql : Exists Clause
 
21:26
Topic : Exists Clause 19th Video of this Series Comments/Suggestions are welcome get in touch with us, by mailing [email protected] for Upcoming trainings. This is an Unedited Video from the Live sessions on Sql (RDBMS) I will be posting a complete series of these tutorials on this channel, If you would like to be notified every time i post something ; Please subscribe to this channel and press the bell icon.
Views: 54 CodeSmith 001
SQL Tutorial for beginners: Difference Between IN and EXISTS Operators in Oracle
 
06:58
Difference Between IN and EXISTS Operators in Oracle SQL Tutorial SQL Tutorial for beginners PLSQL Tutorial PLSQL Tutorial for beginners PL/SQL Tutorial PL SQL Tutorial PL SQL Tutorial for beginners PL/SQL Tutorial for beginners Oracle SQL Tutorial
Views: 811 TechLake
How to connect to an Oracle Database? - Database Tutorial 37
 
12:37
Video 37 - How to connect to a Oracle Database? - Database Tutorial 37 This video explains how to connection to an oracle database. The database, which is Oracle 11g has been installed in a Windows 7 computer.
Views: 121873 Sam Dhanasekaran
SQL SELECT - 13 - SUBCONSULTAS: EXISTS
 
03:57
Todo lo que necesitas en http://tutorialesnet.net
Views: 7133 TutorialesNET
DIFFERENCES BETWEEN IN AND EXISTS OPERATOR
 
18:11
IN AND EXISTS OPERATORS
Views: 2274 SAINAATTH PITTLA
MySQL Tutorial #12 in Hindi: SubQuery(Nested Query) with EXISTS and NOT EXISTS Clause
 
11:37
MySQL Tutorial #12 in Hindi: SubQuery(Nested Query) with EXISTS and NOT EXISTS Clause - Solved Examples MySQL tutorial for Beginners MySQL Installation Guide How to Install MySQL on windows 10
create and use function in sql. not exist in SQL PART 8
 
04:10
sql tutorial for beginners. not exists function in sql. part 8 create and use function in sql. not exists sql statement, how to write an sql statement of the records of a table where not exist in other table (child table) in sql statement. sql tutorial for beginners you can use this statement in sql view, sql stored procedure, sql function. ~~~~~~~~~~~~~ Subscriber will be notified when I will upload new tutorials in future. Many more new tutorials coming soon, so stay tuned! https://www.youtube.com/swiftlearn ~~~~~~~~~~~~~ You can also know all the programming techniques, and bug fixing, error solution in my channel Swift learn. The main topics of this channel are c#.net, asp.net, WCF, sql server, crystal report, RDLC report, HTML, CSS, javascript, Android etc. ~~~~~~~~~~~~~ Share this video with anyone if you think as useful. Please leave any suggestions for future tutorials in the comment section below. ~~~~~~~~~~~~~ Connect with me https://www.facebook.com/groups/swiftlearn/ All playlist c# tutorial for beginners Swift Learn https://www.youtube.com/playlist?list=PLINPYKVRUHyXoPn0-4NIdFn8RrQQDdAki c# linq to sql tutorial Swift Learn https://www.youtube.com/playlist?list=PLINPYKVRUHyVsic1g2CUn2pR5aKjNd3Nc asp.net tutorial for beginners full Swift Learn https://www.youtube.com/playlist?list=PLINPYKVRUHyUjmHrYfAq1l8pe5eXhkZqF crystal report c# in sql Swift Learn https://www.youtube.com/playlist?list=PLINPYKVRUHyWao6CC3Eu0srQxJjgkfLsm SQL Tutorial for beginners full Swift Learn https://www.youtube.com/playlist?list=PLINPYKVRUHyVOv6mx6xU7HEgGcfLk4Kmz
Views: 114 Swift Learn
PL/SQL tutorial 60: Collection Method EXISTS in Oracle Database by Manish Sharma
 
05:21
RebellionRider presents you the latest PL/SQL Tutorial 60 on Collection method EXISTS by Manish Sharma ------------------------------------------------------------------------ ►►►LINKS◄◄◄ Blog : http://bit.ly/exists-function Previous Tutorial ► ------------------------------------------------------------------------- ►Make sure you SUBSCRIBE and be the 1st one to see my videos! ------------------------------------------------------------------------- ►►►Find me on Social Media◄◄◄ Follow What I am up to as it happens on https://twitter.com/rebellionrider http://instagram.com/rebellionrider https://plus.google.com/+Rebellionrider http://in.linkedin.com/in/mannbhardwaj/ ___Facebook Official Page of Manish Sharma___ https://www.facebook.com/TheRebellionRider/ ___Facebook Official Page of RebellionRider.com___ https://www.facebook.com/RebellionRider.official/ You can also Email me at for E-mail address please check the About section Please please LIKE and SHARE my videos it makes me happy. Thanks for liking, commenting, sharing and watching more of our videos This is Manish from RebellionRider.com ♥ I LOVE ALL MY VIEWERS AND SUBSCRIBERS
Views: 7686 Manish Sharma
EXISTS Condition in Oracle Database
 
11:07
#Exists oracle exists vs in, if exists in oracle, oracle not exists vs not in, difference between in and exists in oracle, case when exists oracle, oracle check if record exists, if not exists in oracle, oracle update where exists
Views: 28 Adam Tech
Difference between IN and EXISTS clause in database
 
04:18
Difference between IN and EXISTS clause in database
Views: 736 Techie Savy
Correlated Subqueries with EXISTS & NOT EXIST operators - Oracle SQL Certification Course
 
21:14
Full Playlist link : https://www.youtube.com/playlist?list=PLovUiB6V4l0qdB1MEnHXCUuW6qH5y4FMp Don’t just learn the SQL Language, Become Job-Ready and Launch Your Career as a Certified Oracle SQL Developer! What you’ll learn Become Job Ready to Start Contributing as Database Developer Day 1 Pass the Oracle SQL Fundamentals Examinations Program in the SQL Language to solve a variety of Database Problems Be a SQL Ninja and understand how the Oracle Database Works
Views: 1 UNIQLY TUT
ORACLE SQL AND PL/SQL INTERVIEW QUESTION : SUBQUERY WITH IN / EXISTS OR SELF JOIN
 
09:31
This video demonstrates the solution of the oracle sql interview question like, find the employees where there manager's salary is more than 15000. This is a classic example of using a subquery or a self join to get the result.
Views: 2742 Kishan Mashru
insert data that not exist in second table in oracle sql.
 
03:28
this tutorial in insert data that not exist in second table means you can select the who table. in oracle you have to learn about all concept and query that help full in features. #insert #oracletutorial #oracleprogramming #multiinsert
Views: 13 EasyWay Coding
Pegadinha da Semana Ep. 17 P1 - SQL Exists e Not Exists - Prof. Eduardo Neves 2015
 
26:44
Esta é uma amostra em vídeo de um Curso completo sobre o tema. Mais informações em: http://www.ProvasdeTI.com.br/ Confira também nossa plataforma de simulados para quem está se preparando para Concursos Públicos ou Certificações na área de TI: http://www.Gabaritou.com.br/
Views: 1427 Portal Provas
Como usar el EXISTS en SQL | Curso SQL Server - #60
 
07:21
Ayúdanos a crecer, comparte, dale like y suscribete al canal! ►[http://goo.gl/TZEYAO]◄ GRACIAS POR TU APOYO Y TU LIKE En este vídeo veremos como utilizar el exists para identificar si el mismo dato esta en dos tablas. EXISTS simplemente verifica si la consulta interna arroja alguna fila. Si lo hace, entonces la consulta externa procede. De no hacerlo, la consulta externa no se ejecuta, y la totalidad de la instrucción SQL no arroja nada. ▼Que es Tutoriales y más? ►Somos una comunidad que crece cada vez mas! Nuestro tema principal es la programación pero también nos interesa compartir sobre cualquier cosa que tenga que ver con tecnología e informatica! ►Cursos, tutoriales, reviews, gameplays y hasta algo de música es parte de lo que podrás encontrar si visitas nuestro canal! ► Ayúdanos a Subtitular este y otros videos para llegar a más personas: https://goo.gl/kEr6xW ▼Nuestros Cursos: ►SQL Server: https://goo.gl/7vMQnD ►C#: https://goo.gl/0NZeqM ►Java: https://goo.gl/VhFRR4 ►VB .Net: https://goo.gl/Gwh6O4 ►VBA: https://goo.gl/TxsZz3 ►Iniciándose en la programación: https://goo.gl/dHcmnM ►►Más cursos y vídeos en el canal!◄◄ ▼Encuentranos aquí: ►Facebook: https://goo.gl/iqIZMn ►Grupo de programadores en Facebook: https://goo.gl/sTvbFz ►Twiter: https://goo.gl/WJRoKR ►Blog: https://goo.gl/EOglPi ▼Tal vez te interese! ►Gana $$$ con tu canal [VISO]: http://bbtv.go2cloud.org/SHQK ►App del canal para tu navegador: https://goo.gl/Czkl9C ►Donativos: http://goo.gl/us1GDG ▼Código y más! ►Repositorio del Query del curso de SQL Server: https://goo.gl/LSig71
Views: 2951 Tecnología Binaria;
IN v/s EXISTS v/s JOIN, which one will give better performance under what condition?
 
04:56
This video demonstrates the performance effects of using an exists clause instead of an IN clause, also it shows how we can update a simple sub query having an IN clause with an EXISTS or JOIN statement. It also shows that joining would consider the null data, where as an IN clause would neglect null values.
Views: 1141 Kishan Mashru
How to use EXISTS and NOT EXISTS in correlated Subqueries in Sql Server
 
09:53
EXISTS in correlated Subqueries in Sql Server, NOT EXISTS in correlated Subqueries in Sql Server
Views: 54 C Plus+
How to Start,Stop Pluggable database-Oracle 12C administration
 
09:32
How to Start,Stop Pluggable database-Oracle 12C administration =================================================== Important Command SQL= show con_name; CON_NAME ------------------------------ CDB$ROOT SQL-- sho pdbs; CON_ID CON_NAME OPEN MODE RESTRICTED ---------- ------------------------------ ---------- ---------- 3 PDB MOUNTED SQL alter session set container=PDB;
Views: 6270 ANKUSH THAVALI
Ms Sql Server Dersleri - EXISTS Kullanımı
 
08:40
Sql server ile geriye true yada false olarak sonuç döndüren EXISTS yapısının kullanımını öğreniyoruz. http://www.yildirimsoker.com/sql-server-dersleri-exists-kullanimi/
Views: 2300 Yıldırım Söker
SQL Server except operator
 
05:14
sql except example sql except operator example sql server except example sql server except order by sql server except clause SQL Server except operator In this video we will discuss SQL Server except operator with examples. EXCEPT operator returns unique rows from the left query that aren’t in the right query’s results. Introduced in SQL Server 2005 The number and the order of the columns must be the same in all queries The data types must be same or compatible This is similar to minus operator in oracle Let us understand this with an example. SQL Script to create the tables Create Table TableA ( Id int primary key, Name nvarchar(50), Gender nvarchar(10) ) Go Insert into TableA values (1, 'Mark', 'Male') Insert into TableA values (2, 'Mary', 'Female') Insert into TableA values (3, 'Steve', 'Male') Insert into TableA values (4, 'John', 'Male') Insert into TableA values (5, 'Sara', 'Female') Go Create Table TableB ( Id int primary key, Name nvarchar(50), Gender nvarchar(10) ) Go Insert into TableB values (4, 'John', 'Male') Insert into TableB values (5, 'Sara', 'Female') Insert into TableB values (6, 'Pam', 'Female') Insert into TableB values (7, 'Rebeka', 'Female') Insert into TableB values (8, 'Jordan', 'Male') Go Notice that the following query returns the unique rows from the left query that aren’t in the right query’s results. Select Id, Name, Gender From TableA Except Select Id, Name, Gender From TableB To retrieve all of the rows from Table B that does not exist in Table A, reverse the two queries as shown below. Select Id, Name, Gender From TableB Except Select Id, Name, Gender From TableA You can also use Except operator on a single table. SQL script to create tblEmployees table Create table tblEmployees ( Id int identity primary key, Name nvarchar(100), Gender nvarchar(10), Salary int ) Go Insert into tblEmployees values ('Mark', 'Male', 52000) Insert into tblEmployees values ('Mary', 'Female', 55000) Insert into tblEmployees values ('Steve', 'Male', 45000) Insert into tblEmployees values ('John', 'Male', 40000) Insert into tblEmployees values ('Sara', 'Female', 48000) Insert into tblEmployees values ('Pam', 'Female', 60000) Insert into tblEmployees values ('Tom', 'Male', 58000) Insert into tblEmployees values ('George', 'Male', 65000) Insert into tblEmployees values ('Tina', 'Female', 67000) Insert into tblEmployees values ('Ben', 'Male', 80000) Go Except operator on a single table Select Id, Name, Gender, Salary From tblEmployees Where Salary ]= 50000 Except Select Id, Name, Gender, Salary From tblEmployees Where Salary ]= 60000 Order By clause should be used only once after the right query Select Id, Name, Gender, Salary From tblEmployees Where Salary ]= 50000 Except Select Id, Name, Gender, Salary From tblEmployees Where Salary ]= 60000 order By Name Text version of the video http://csharp-video-tutorials.blogspot.com/2015/09/sql-server-except-operator.html Slides http://csharp-video-tutorials.blogspot.com/2015/09/adsbygoogle-window.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 41989 kudvenkat
Merge: Databases for Developers #17
 
05:26
Sometimes when adding rows to your database need update-if-exists, insert-if-not-exists logic. Aka an upsert. You could write this as separate update and insert statements. But there is an easier way: Merge! Watch this video for an overview of how merge works. Further reading: Merge documentation: https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/MERGE.html Delete rows not in the source using merge: https://technology.amis.nl/2006/10/14/have-merge-remove-records-from-target-that-are-not-in-the-source-oracle-10g/ Take the course: https://devgym.oracle.com/pls/apex/dg/class/databases-for-developers-next-level.html Need help with SQL? Ask us over on AskTOM: https://asktom.oracle.com Twitter: https://twitter.com/ChrisRSaxon Daily SQL Twitter tips: https://twitter.com/SQLDaily All Things SQL blog: https://blogs.oracle.com/sql/ ============================ The Magic of SQL with Chris Saxon Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Views: 876 The Magic of SQL
Understanding Correlated Queries in SQL
 
08:13
Join Discussion: http://www.techtud.com/video-lecture/understanding-correlated-queries-sql IMPORTANT LINKS: 1) Official Website: http://www.techtud.com/ 2) Virtual GATE: http://virtualgate.in/login/index.php Both of the above mentioned platforms are COMPLETELY FREE, so feel free to Explore, Learn, Practice & Share! Our Social Media Links: Facebook Page: https://www.facebook.com/techtuduniversity Facebook Group: https://www.facebook.com/groups/virtualgate Google+ Page: https://plus.google.com/+techtud/posts Last but not the least, SUBSCRIBE our YouTube channel to stay updated about the regularly uploaded new videos.
Views: 51872 Techtud
SQL 136 Subselect, EXISTS with Subselects
 
03:37
Explains how EXISTS with subselects work. From http://ComputerBasedTrainingInc.com SQL Course. Learn by doing SQL commands for ANSI Standard SQL, Access, DB2, MySQL, Oracle, PostgreSQL, and SQL Server.
Views: 4877 cbtinc
SQL Update
 
11:17
Video showing the basics of an UPDATE statement in SQL that is used to change fields in a record that currently exists in a database table.
Views: 723 Mr Long IT & CAT
SQL script to insert into many to many table
 
14:52
Text Article http://csharp-video-tutorials.blogspot.com/2017/02/sql-script-to-insert-into-many-to-many.html Slides http://csharp-video-tutorials.blogspot.com/2017/02/sql-script-to-insert-into-many-to-many_6.html SQL Server Interview Questions and Answers text articles & slides http://csharp-video-tutorials.blogspot.com/2014/05/sql-server-interview-questions-and.html SQL Server Interview Questions and Answers playlist https://www.youtube.com/playlist?list=PL6n9fhu94yhXcztdLO7i6mdyaegC8CJwR All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss how to insert data into a table that has many-to-many relationship Create table Students ( Id int primary key identity, StudentName nvarchar(50) ) Go Create table Courses ( Id int primary key identity, CourseName nvarchar(50) ) Go Create table StudentCourses ( StudentId int not null foreign key references Students(Id), CourseId int not null foreign key references Courses(Id) ) Go Students - Id column is identity column Courses - Id column is identity column StudentCourses - StudentId and CourseId columns are foreign keys referencing Id column in Students and Courses tables As you can see, StudentCourses is a bridge table that has many to many relationship with Students and Courses tables. This means a given student can be enrolled into many courses and a given course can have many students enrolled. Below is the question asked in an interview for SQL Server Developer role. Write a SQL script to insert data into StudentCourses table. Here are the rules that your script should follow. 1. There will be 2 inputs for the script Student Name - The name of the student who wants to enroll into a course Course Name - The name of the course the student wants to enroll into 2. If the student is already in the Students table, then use that existing Student Id. If the student is not already in the Students table, then a row for that student must be inserted into the Students table, and use that new student id. 3. Along the same lines, if the course is already in the Courses table, then use that existing Course Id. If the course is not already in the Courses table, then a row for that course must be inserted into the Courses table, and use that new course id. 4. There should be no duplicate student course enrollments, i.e a given student must not be enrolled in the same course twice. For example, Tom must not be enrolled in C# course twice. Answer : To avoid duplicate student course enrollments create a composite primary key on StudentId and CourseId columns in StudentCourses table. With this composite primary key in place, if someone tries to enroll the same student in the same course again we get violation of primary key constraint error. Alter table StudentCourses Add Constraint PK_StudentCourses Primary Key Clustered (CourseId, StudentId) Here is the SQL script that inserts data into the 3 tables as expected Declare @StudentName nvarchar(50) = 'Sam' Declare @CourseName nvarchar(50) = 'SQL Server' Declare @StudentId int Declare @CourseId int -- If the student already exists, use the existing student ID Select @StudentId = Id from Students where StudentName = @StudentName -- If the course already exists, use the existing course ID Select @CourseId = Id from Courses where CourseName = @CourseName -- If the student does not exist in the Students table If (@StudentId is null) Begin -- Insert the student Insert into Students values(@StudentName) -- Get the Id of the student Select @StudentId = SCOPE_IDENTITY() End -- If the course does not exist in the Courses table If (@CourseId is null) Begin -- Insert the course Insert into Courses values(@CourseName) -- Get the Id of the course Select @CourseId = SCOPE_IDENTITY() End -- Insert StudentId & CourseId in StudentCourses table Insert into StudentCourses values(@StudentId, @CourseId) If required, we can very easily convert this into a stored procedure as shown below. Create procedure spInsertIntoStudentCourses @StudentName nvarchar(50), @CourseName nvarchar(50) as Begin Declare @StudentId int Declare @CourseId int Select @StudentId = Id from Students where StudentName = @StudentName Select @CourseId = Id from Courses where CourseName = @CourseName If (@StudentId is null) Begin Insert into Students values(@StudentName) Select @StudentId = SCOPE_IDENTITY() End If (@CourseId is null) Begin Insert into Courses values(@CourseName) Select @CourseId = SCOPE_IDENTITY() End Insert into StudentCourses values(@StudentId, @CourseId) End Use the following statement to execute the stored procedure Execute spInsertIntoStudentCourses 'Tom','C#'
Views: 89217 kudvenkat
Understanding the use of GROUP BY clause in SQL
 
04:39
Join discussion: http://www.techtud.com/video-lecture/understanding-group-clause-sql IMPORTANT LINKS: 1) Official Website: http://www.techtud.com/ 2) Virtual GATE: http://virtualgate.in/login/index.php Both of the above mentioned platforms are COMPLETELY FREE, so feel free to Explore, Learn, Practice & Share! Our Social Media Links: Facebook Page: https://www.facebook.com/techtuduniversity Facebook Group: https://www.facebook.com/groups/virtualgate Google+ Page: https://plus.google.com/+techtud/posts Last but not the least, SUBSCRIBE our YouTube channel to stay updated about the regularly uploaded new videos.
Views: 73591 Techtud
SQL tutorial 60: SQL View in Oracle Database By Manish Sharma RebellionRider
 
07:30
SQL View in Oracle Database. In this tutorial you will learn how to create a vie as well as how to replace a view along with the examples of all the DML e.g. DESCRIBE, SELECT, UPDATE, INSERT and Delete on view by Manish Sharma RebellionRider ------------------------------------------------------------------------ ►►►LINKS◄◄◄ Blog : http://bit.ly/sql-view-in-oracle-database Previous Tutorial ► Tut 5: SELECT statement http://youtu.be/f_mVBVgnqmM ------------------------------------------------------------------------- ►►►Help Me In Getting A Job◄◄◄ ►Help Me In Getting A Good Job By Connecting With Me on My LinkedIn and Endorsing My Skills. All My Contact Info is Down Below. You Can Also Refer Me To Your Company Thanks ------------------------------------------------------------------------- Copy Cloud referral link || Use this link to join copy cloud and get 20GB of free storage https://copy.com?r=kb4rc1 -------------------------------------------------------------------------- ►Make sure you SUBSCRIBE and be the 1st one to see my videos! -------------------------------------------------------------------------- Amazon Wishlist: http://bit.ly/wishlist-amazon ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ►►►Find me on Social Media◄◄◄ Follow What I am up to as it happens on https://twitter.com/rebellionrider https://www.facebook.com/imthebhardwaj http://instagram.com/rebellionrider https://plus.google.com/+Rebellionrider http://in.linkedin.com/in/mannbhardwaj/ http://rebellionrider.tumblr.com/ http://www.pinterest.com/rebellionrider/ You can also Email me at [email protected] Please please LIKE and SHARE my videos it makes me happy. Thanks for liking, commenting, sharing and watching more of our videos This is Manish from RebellionRider.com ♥ I LOVE ALL MY VIEWERS AND SUBSCRIBERS
Views: 43137 Manish Sharma
Difference between where and having in sql server
 
06:36
sql server where vs having sql server group by where having group by having sql server In this vide we will discuss the difference between where and having caluses in sql server. Let us understand the difference with an example. To calculate total sales by product, we would write a GROUP BY query as shown below SELECT Product, SUM(SaleAmount) AS TotalSales FROM Sales GROUP BY Product Now if we want to find only those products where the total sales amount is greater than $1000, we will use HAVING clause to filter products SELECT Product, SUM(SaleAmount) AS TotalSales FROM Sales GROUP BY Product HAVING SUM(SaleAmount) ] 1000 If we use WHERE clause instead of HAVING clause, we will get a syntax error. This is because the WHERE clause doesn’t work with aggregate functions like sum, min, max, avg, etc. SELECT Product, SUM(SaleAmount) AS TotalSales FROM Sales GROUP BY Product WHERE SUM(SaleAmount) ] 1000 So in short, the difference is WHERE clause cannot be used with aggregates where as HAVING can. However, there are other differences as well that we need to keep in mind when using WHERE and HAVING clauses. WHERE clause filters rows before aggregate calculations are performed where as HAVING clause filters rows after aggregate calculations are performed. Let us understand this with an example. Total sales of iPhone and Speakers can be calculated by using either WHERE or HAVING clause Calculate Total sales of iPhone and Speakers using WHERE clause : In this example the WHERE clause retrieves only iPhone and Speaker products and then performs the sum. SELECT Product, SUM(SaleAmount) AS TotalSales FROM Sales WHERE Product in ('iPhone', 'Speakers') GROUP BY Product Calculate Total sales of iPhone and Speakers using HAVING clause : This example retrieves all rows from Sales table, performs the sum and then removes all products except iPhone and Speakers. SELECT Product, SUM(SaleAmount) AS TotalSales FROM Sales GROUP BY Product HAVING Product in ('iPhone', 'Speakers') So from a performance standpoint, HAVING is slower than WHERE and should be avoided when possible. Another difference is WHERE comes before GROUP BY and HAVING comes after GROUP BY. Difference between WHERE and Having 1. WHERE clause cannot be used with aggregates where as HAVING can. This means WHERE clause is used for filtering individual rows where as HAVING clause is used to filter groups. 2. WHERE comes before GROUP BY. This means WHERE clause filters rows before aggregate calculations are performed. HAVING comes after GROUP BY. This means HAVING clause filters rows after aggregate calculations are performed. So from a performance standpoint, HAVING is slower than WHERE and should be avoided when possible. 3. WHERE and HAVING can be used together in a SELECT query. In this case WHERE clause is applied first to filter individual rows. The rows are then grouped and aggregate calculations are performed, and then the HAVING clause filters the groups. Text version of the video http://csharp-video-tutorials.blogspot.com/2015/09/difference-between-where-and-having-in.html Slides http://csharp-video-tutorials.blogspot.com/2015/09/difference-between-where-and-having-in_15.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html Full SQL Server Course https://www.youtube.com/playlist?list=PL4cyC4G0M1RQ_Rm52cQ4CcOJ_T_HXeMB4 All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 71177 kudvenkat
ACCESS 2016 SQL LESSON  26 USING THE EXIST OPERATOR WITH  SELECT
 
05:40
Using the SQL operator EXISTS in conjunction with the SELECT statement
How to start the oracle database,  ORA-01033: ORACLE initialization or shutdown in progress
 
04:40
ORA-01033: ORACLE initialization or shutdown in progress when oracle display error message ORA-01033, its mean that our database is not in working. For that it is very necessary to start the database. for that connect with the sys as sysdba user. and write the command startup open;
Views: 12234 Data Science Center
Exists clause in SQL Server - Part 29
 
07:11
Subscribe to IT PORT : https://www.youtube.com/c/itport28 SQL Server Tutorial in Tamil : https://www.youtube.com/playlist?list=PLouAaeZ4xQ64enJDwWVvN3KduuZRlUrb3 SQL Server Concepts in Tamil : https://www.youtube.com/playlist?list=PLouAaeZ4xQ67kdNIByJKAGBIBhor_h4Hs SQL Server Analytic Functions in Tamil : https://www.youtube.com/playlist?list=PLouAaeZ4xQ65XIU5azEUgLVrBKEl-jWMV SQL Server Tutorial : https://www.youtube.com/playlist?list=PLouAaeZ4xQ66AYrzPtxt2SeeR4UABcBcO SQL Server Concepts : https://www.youtube.com/playlist?list=PLouAaeZ4xQ66zRe8-nDDy-YHY2o0rmbn4 SQL Server Analytic Functions : https://www.youtube.com/playlist?list=PLouAaeZ4xQ64hTsEdhLsVBquE1vERWngX The EXISTS clause is used to test for the existence of any record in a sub query and it returns true if the sub query returns one or more records.
Views: 96 IT Port