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Oracle COUNT Function
 
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https://www.databasestar.com/oracle-count/ The Oracle COUNT function is used to count the number of rows from the column, or number of values, provided to it. It’s commonly used to find the number of rows returned by a SELECT query. The syntax of the COUNT function is: COUNT ( [ * | [ DISTINCT | ALL ] expression) [ over (analytic_clause) ] There’s a lot of square brackets here, indicating optional parameters and choices. This just means you can use the COUNT function in a few different ways: COUNT(*) COUNT(DISTINCT expression) COUNT(ALL expression) COUNT(*) OVER (analytic_clause) COUNT(DISTINCT expression) OVER (analytic_clause) COUNT(ALL expression) OVER (analytic_clause) It can be used as an aggregate or analytic function. The parameters of the COUNT function are: - expression: The expression to count the values of. This can be a column or a set of values, for example. - analytic_clause: This is used to specify the criteria for an analytic query. COUNT(*) is the most common way to use this function, I’ve found. As COUNT(*) is an aggregate function, like all aggregate functions the columns mentioned in the SELECT clause need to exist in the GROUP BY clause. NULL values are ignored by COUNT(expression), but they are counted when using COUNT(*). COUNT(*) has the exact same calculation and performance as COUNT(1). For more information about the Oracle COUNT function, including all of the SQL shown in this video and the examples, read the related article here: https://www.databasestar.com/oracle-count/
Views: 92 Database Star
DISTINCT Clause & UNIQUE Keyword in Oracle | Oracle Tutorials for Beginners
 
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DISTINCT & UNIQUE Keyword in Oracle | Oracle Tutorials for Beginners DISTINCT Keyword in Oracle DISTINCT Clause in Oracle UNIQUE Keyword in Oracle UNIQUE Clause in Oracle Oracle Tutorials for Beginners Oracle Tutorials for Beginners select distinct * sql distinct multiple columns sql distinct count select distinct on one column with multiple columns returned select distinct mysql sql count distinct multiple columns oracle distinct count sql distinct group by sql count distinct two columns select distinct on one column with multiple columns returned select distinct on one column with multiple columns returned oracle sql select unique values from multiple columns select distinct multiple columns mysql select distinct all columns sql count distinct multiple columns group by sql select distinct multiple columns group by select distinct oracle select distinct rows sql select distinct multiple columns select distinct on one column select count distinct select unique mysql how to select unique records in oracle without using distinct sql select distinct values and count of each Oracle Tutorials for Beginners Oracle Tutorials for Beginners Oracle Tutorials for Beginners Oracle Tutorials for Beginners
Views: 388 Oracle PL/SQL World
ORACLE SQL 6: Distinct & Count
 
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http://studyandshare.wordpress.com/ http://www.facebook.com/groups/studyandsharevn/
Views: 920 studyandsharevn
COUNT DISTINCT
 
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How to count DISTINCT records and also talk about how MAX function can be used on all datatypes
Views: 7861 Lew Cousineau
[Oracle] Bài 6 - Distinct & Count
 
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============================================== - NLITS VietNam là kênh truyền thông đa phương tiện được quản lý bởi NLits nhầm cung cấp các video thuộc mọi lĩnh vực từ giải trí cho đến học tập. - Vui lòng ghi rõ nguồn NLitsolution khi re-up video từ kênh của chúng tôi lên website của bạn. Chân thành cảm ơn. © Bản Quyền Thuộc Về NLITSolution + Website: http://www.nlits.net + Email: [email protected]
Views: 445 NLITS VietNam
Oracle Database11g tutorials 8 || SQL DISTINCT with multiple columns |SQL Distinct with Two columns
 
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This SQL tutorial and Oracle database 11g tutorial for beginners will show how to use SQL DISTINCT keyword with SQL Select clause. This Video is in the continuation of previous video on SQL distinct with one column. In this video we will see How to use SQL distinct with multiple columns and SQL distinct with two columns Tool used in this tutorial is SQL developer. This tutorial series is part of SQL expert exam certification training. If you are preparing for SQL certification you can use my tutorials. This SQL Tutorial is a part of free training. Copy Cloud referral link || Use this link to join copy cloud and get 20GB of free storage https://copy.com?r=j7eYO7 Contacts Email [email protected] Twitter https://twitter.com/rebellionrider Instagram http://instagram.com/rebellionrider Facebook. https://www.facebook.com/imthebhardwaj Linkedin. in.linkedin.com/in/mannbhardwaj/ Thanks for linking, commenting, sharing and watching more of our videos This is Manish From The Code makers
Views: 96524 Manish Sharma
Oracle Approximate Count Distinct Function
 
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oracle 12c new features Oracle Approximate Count Distinct Function. APPROX_COUNT_DISTINCT Function to compute approximate count of distinct values in table. https://easy-learning-tech.blogspot.in/2018/05/oracle-approximate-count-distinct.html oracle 12c new features for developers
Views: 42 Siva Academy
SQL: Count, Distinct
 
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วิธีการใช้งานคำสั่ง Count, Distinct โดยนางสาวปาริฉัตร แหลมคม นักศึกษาหลักสูตรประกาศนียบัตรวิชาชีพชั้นสูง สาขาวิชาเวชระเบียน ชั้นปีที่ 2
Views: 352 mrs kmpht
Oracle SQL PLSQL 12C Tutorial 9 - DISTINCT Command, Unique Data
 
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This Video Tutorial Will Describe how to get DISTINCT OR unique values or data from a table in oracle 12C version. This command will also work on other versions of database like Oracle 11g Database, Oracle 10g Database, Oracle 9i Database, Oracle 8i Database, Oracle 8 Database and so on. Whenever you create a new table in oracle, sometimes you just insert the duplicate data or sometimes you need to get only some columns of data which are duplicate but the row is unique. In that case, you need this DISTINCT clause. Full Syntax will be given in this video tutorial about how to get unique records from oracle database table. Along with the live example to get DISTINCT records. All the keywords, format, mandatory clauses etc are described in this video.
SQL Distinct and Multiple Columns
 
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Jamie King of Neumont University showing how SQL DISTINCT varies when multiple columns are present in the result set.
Views: 17454 Jamie King
Learn SQL: Lesson 5 - SUM,AVG,COUNT, GROUP BY, & DISTINCT
 
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Learn how to use SUM, AVG, COUNT, and DISTINCT commands in T-SQL. Briefly review Intellisense and Group By. Music for the channel: "Zap Beat", "Hitman", "Danger Storm", "Urban Gauntlet" Kevin Macleod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/
Views: 888 DASGeek
Oracle Clauses(distinct,having,group by,order by,from) and avg(),sum(),count
 
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Oracle Clauses(distinct,having,group by,order by,from) and avg(),sum(),count
Views: 31 Manohar Sambaa
SQL DISTINCT Within a SELECT - Retrieving Unique Values
 
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Jamie King of Neumont University demonstrating use of DISTINCT within a SQL SELECT command.
Views: 21031 Jamie King
Oracle regular expression regexp count
 
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Unix Shell Scripting
Views: 1225 Sridhar Raghavan
SELECT STATMENTS DISTINCT KEYWORD AND COUNT FUNCTION IN SQL
 
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HOW TO GET ALL COLUMNS WITH ALL ROWS, HOW TO GET UNIQUE VALUES FROM A COLUMN AND USE OF COUNT FUNCTION
Views: 18 Dilip MJ Gangwar
Sql Training Online - Sql Count Function
 
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Learn about the Count function in the SQL Language. Visit http://www.SqlTrainingOnline.com for 30 more FREE videos. The Microsoft SQL Server 2012 SQL Count Function is used to give you a total number of records in your resultset or within a group of data. You would group the data using a group by clause in the SQL Statement. You can visit me at any of the following: SQL Training Online: http://www.sqltrainingonline.com Twitter: http://www.twitter.com/sql_by_joey Google+: https://plus.google.com/#100925239624117719658/posts LinkedIn: http://www.linkedin.com/in/joeyblue Facebook: http://www.facebook.com/sqltrainingonline
Views: 20478 Joey Blue
10 Ways to get distinct values without using DISTINCT keyword
 
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Watch video in HD mode for better clarity. Click on Settings -- Quality and Choose 1080p for HD mode. In this video you will learn "10 new ways to get distinct values without using DISTINCT keyword". Subscribe to my channel and do like this video so that you don't miss my latest updates. To get all these new ways at one place visit out website www.learnwitharun.com Web : www.learnwitharun.com
Views: 248 Arun
12a of 15 SQL Basics with Oracle - Variations for the COUNT() function
 
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This video looks at three variations of the COUNT() function: COUNT(*), COUNT(field_name) and COUNT(DISTINCT field_name). The examples in the video show what the differences are in the result set for each COUNT variation. (12a of 15)
Views: 1497 Jennifer Kreie
SQL Inner Join Multiple Tables with SUM Tutorial - SQL 2008/2012/2016/2017
 
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Use inner joins with multiple tables to create reports. Uses aliases, and the SUM aggregate function to demonstrate the flexibility of the join statement. Get the SQL script to create the database and run the exercies in the video here: https://www.qewbi.com/sql/scripts/qewbijoins.zip
Views: 129859 Edward Kench
Distinct operator in oracle in hindi ,english
 
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Description. The Oracle DISTINCT clause is used to remove duplicates from the result set. ... Syntax. The syntax for the DISTINCT clause in Oracle/PLSQL is: SELECT DISTINCT expressions FROM tables [WHERE conditions]; ... Note. ... Example - With Single Expression. ... Example - With Multiple Expressions. distinct on multiple columns in sql oracle distinct count oracle select distinct on one column where distinct sql sql distinct group by how to select unique records in oracle without using distinct select distinct count SQL Tutorial in Oracle - 4 NULL, LIKE, DISTINCT, ORDER BY SQL SELECT statement is used to fetch the data from a database table which returns data in the form of result table. These result ... Oracle Database11g tutorials 8 || SQL DISTINCT with multiple columns |SQL Distinct with Two columns will show how to use SQL DISTINCT keyword with SQL Select ... SQL Tutorial - 27: The DISTINCT Keyword The Bad Tutorials In this tutorial we'll see how we can pull out unique data from tables using the DISTINCT Clause in our Queries. 55. SELECT DISTINCT in SQL (Hindi) • Please Subscribe Channel Like, Share and Comment Visit : DISTINCT Clause in Oracle | Oracle SQL Tutorial Videos | • DISTINCT Clause in Oracle. Oracle Database11g tutorials 7 | |SQL DISTINCT keyword || SQL tutorials This SQL tutorial and Oracle database 11g tutorial for beginners will show how to use SQL DISTINCT keyword with SQL Select ... 06- Oracle SQL-Arabic Course Concatenation Operator-Quote q Operator-DISTINCT-DESCRIBEاوراكل ديفلوبر • أهلا بكم فى درس جديد من سلسلة دروس أوراكل ديفلوبر شرح SQL فى درس اليوم نتحدث عن Concatenation Operator & Quote q Operator & ... SQL with Oracle 10g XE - Using the DISTINCT Function Lecture Snippets In this video I use the DISTINCT function to list the values of a column from a query and remove the duplicate listings. When using ... SQL Distinct and Multiple Columns • Jamie King of Neumont University showing how SQL DISTINCT varies when multiple columns are present in the result set. Learn Oracle | Alias Names, Concatenation, Distinct Keyword Pebbles present, Learn Oracle 10g with Step By Step Video Tutorials. Learn Oracle 10g Tutorial series contains the following ... 8:54 Oracle Database tutorials 1: How to install Oracle Database 11g on windows 7 How To install Oracle Database 11g enterprise edition On windows 64 bit. Full installation in Single video. Enjoy SQL and ... Related
Views: 19 Muo sigma classes
SQL Aggregation queries using Group By, Sum, Count and Having
 
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From SQL Queries Joes 2 Pros (Vol2) ch4.1. Learn up to write aggregated queries.
Views: 162098 Joes2Pros SQL Trainings
SQL Tutorial in Oracle - 4 NULL, LIKE, DISTINCT, ORDER BY
 
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SQL SELECT statement is used to fetch the data from a database table which returns data in the form of result table. These result tables are called result-sets. The LIKE operator is used in a WHERE clause to search for a specified pattern in a column. In SQL, wildcard characters are used with the SQL LIKE operator. SQL wildcards are used to search for data within a table. With SQL, the wildcards are: Wildcard Description % A substitute for zero or more characters _ A substitute for a single character [charlist] Sets and ranges of characters to match [^charlist] or [!charlist] Matches only a character NOT specified within the brackets Check out our website: http://www.telusko.com Follow Telusko on Twitter: https://twitter.com/navinreddy20 Follow on Facebook: Telusko : https://www.facebook.com/teluskolearnings Navin Reddy : https://www.facebook.com/navintelusko Follow Navin Reddy on Instagram: https://www.instagram.com/navinreddy20 Subscribe to our other channel: Navin Reddy : https://www.youtube.com/channel/UCxmkk8bMSOF-UBF43z-pdGQ?sub_confirmation=1 Telusko Hindi : https://www.youtube.com/channel/UCitzw4ROeTVGRRLnCPws-cw?sub_confirmation=1
Views: 16455 Telusko
SQL with Oracle 10g XE - Using the COUNT and SUM Functions
 
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In this video I use the COUNT and SUM functions available to the SQL language. I used the COUNT function to add up the number of records in my query. This function works well with all data types and will just count the number or records that result from the conditions of your query. The SUM function will add up the numeric values and produce a total amount of a column. When using a function be sure to use parenthesis around the column you are performing the function on. This video is part of a series of videos with the purpose of learning the SQL language. For more information visit Lecture Snippets at http://lecturesnippets.com.
Views: 7601 Lecture Snippets
Oracle SQL Video Tutorial 6: DISTINCT keyword
 
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Oracle SQL Video Tutorials 6: DISTINCT keyword explained
Views: 1161 Just Channel
Oracle SQL Video Tutorial 29 - COUNT function
 
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Oracle SQL Video Tutorials 29 - COUNT function explained.In This Oracle SQL Tutorial for Beginners, I have explained basics of SQL.These examples work on Oracle 10g and Oracle 11g database. These helps youto understand Oracle Joins and helps beginners. Iam going to add more tutorials on Oracle DBA, Oracle RAC and Oracle PL/SQL.All Oracle sql tutorial with examples are executed on Oracle 11g using Oracle SQL Developer.
Views: 2893 Just Channel
Oracle SQL Developer Tutorial For Beginners  15   SELECT COUNT
 
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Oracle SQL Developer Tutorial For Beginners Series. This course introduces Oracle SQL Development for its subscribers. Currently this is based on Oracle 12c. The test environment is in Windows 10.
Views: 2622 Sam Dhanasekaran
Counting Data Within Groups with GROUP BY (Introduction to Oracle SQL)
 
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How to use grouping and count to count occurrences of data
Views: 177 Database Star
Let's Learn SQL! Lesson 16 : Distinct Command vs Group By
 
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Explore SQL with Tom Coffing of Coffing Data Warehousing! In this lesson, learn the differences between the Distinct Command and Group By in SQL!
SQL with Oracle 10g XE - Using the DISTINCT Function
 
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In this video I use the DISTINCT function to list the values of a column from a query and remove the duplicate listings. When using the DISTINCT function be sure to have parenthesis around the column you wish to perform the function on. You can't use the * to list all the columns in the SELECT command, so you will need to write the columns you wish to see out. If you want to rename the column you created with the function use the keyword AS on the SELECT line. This video is part of a series of videos with the purpose of learning the SQL language. For more information visit Lecture Snippets at http://lecturesnippets.com.
Views: 3557 Lecture Snippets
APPROX_COUNT_DISTINCT Function in Oracle Database 11g and 12c
 
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This video demonstrates how to quickly improve the performance of calculating the number of distinct values using the APPROX_COUNT_DISTINCT function. For more information see: https://oracle-base.com/articles/12c/approx-count-distinct-12cr1 Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Kris Rice Blog: http://krisrice.blogspot.com/ Twitter: https://twitter.com/krisrice Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 650 ORACLE-BASE.com
Grouping Functions in SQL Query Like AVG,SUM,MAX,MIN
 
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SQL COUNT (): This function returns the number of rows in the table that satisfies the condition specified in the WHERE condition. If the WHERE condition is not specified, then the query returns the total number of rows in the table. For Example: If you want the number of emps in a particular department, the query would be: SELECT COUNT (*) FROM emp WHERE deptno = 10; If you want the total number of emps in all the department, the query would take the form: SELECT COUNT (*) FROM emp; SQL DISTINCT(): This function is used to select the distinct rows. For Example: If you want to select all distinct department names from emp table, the query would be: SELECT DISTINCT deptno FROM emp; To get the count of emps with unique name, the query would be: SELECT COUNT (DISTINCT name) FROM emp; SQL MAX(): This function is used to get the maximum value from a column. To get the maximum salary drawn by an emp, the query would be: SELECT MAX (salary) FROM emp; SQL MIN(): This function is used to get the minimum value from a column. To get the minimum salary drawn by an emp, he query would be: SELECT MIN (salary) FROM emp; SQL AVG(): This function is used to get the average value of a numeric column. To get the average salary, the query would be SELECT AVG (salary) FROM emp; SQL SUM(): This function is used to get the sum of a numeric column To get the total salary given out to the emps, SELECT SUM (salary) FROM emp;
Views: 11387 WingsOfTechnology
SelectTec | Aula Nº 24 | Count - Oracle SQL Developer
 
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Count Syntax: select count(*) from tabela; select count(coluna) from tabela;
Views: 1375 SelectTec
SQL Server Management Studio Count Records and Count DISTINCT Records
 
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Ever needed to count a lot of records in your project? In this example, we are going to count 2 sets of records. 1 - Count the amount of times a user has made a comment. 1 - Count the amount of post that the user has commented on. This comes in handy, on sites such as, Forums and such. This example will show you not only how to count records, but will also show you how to create a new Query and how to add tables and use the Group By functions within SQL Server Management Studio. Thank You Wayne Barron http://www.cffcs.com http://www.enterview.org/Coding_Source
Views: 4405 Dark Effects Studios
Getting Unique Records with DISTINCT (Introduction to Oracle SQL)
 
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How to find unique records using the DISTINCT keyword
Views: 88 Database Star
Part 4   Delete duplicate rows in sql
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/05/part-4-delete-duplicate-rows-in-sql.html In this video, we will discuss deleting all duplicate rows except one from a sql server table. SQL Script to create Employees table Create table Employees ( ID int, FirstName nvarchar(50), LastName nvarchar(50), Gender nvarchar(50), Salary int ) GO Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000) Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000) Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000) Insert into Employees values (2, 'Mary', 'Lambeth', 'Female', 30000) Insert into Employees values (2, 'Mary', 'Lambeth', 'Female', 30000) Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000) Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000) Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000) The delete query should delete all duplicate rows except one. Here is the SQL query that does the job. PARTITION BY divides the query result set into partitions. WITH EmployeesCTE AS ( SELECT *, ROW_NUMBER()OVER(PARTITION BY ID ORDER BY ID) AS RowNumber FROM Employees ) DELETE FROM EmployeesCTE WHERE RowNumber ] 1
Views: 311961 kudvenkat
19 SQL with Oracle 10g XE   Using the COUNT and SUM Functions
 
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19 SQL with Oracle 10g XE Using the COUNT and SUM Functions
Views: 49 Cambo Movies
Hướng Dẫn Lập Trình ORACLE SQL bài 6   Câu lệnh  Distinct & Count
 
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Video Hướng dẫn này được mình sưu tầm trên mạng và mong muốn chia sẻ kiến thức đến mọi người 1 cách tốt nhất. Mọi người có thể vào trang blog của mình để đảm bảo cho các bạn nhận được những video của mình đã sưu tập 1 cách tốt nhất và chất lượng nhất Mọi người truy cập tại: http://laptrinhoracle.blogspot.com/ để xem đầy đủ video hướng dẫn Các từ khóa bạn tìm kiếm trên google: Video hướng dẫn lập trình oracle hướng dẫn lập trình oracle Lập trình oracle blogspot Lập trình oracle blog hướng dẫn cài đặt oracle blogspot Video hướng dẫn lập trình oracle blogspot
Views: 1255 Hau Van
HAVING clause and difference with GROUP BY & WHERE clause in SQL statement
 
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Using HAVING clause and difference with GROUP BY & WHERE clause in SQL statement Link for scripts on my blog: https://sqlwithmanoj.com/2015/05/23/sql-basics-difference-between-where-group-by-and-having-clause/ Check the whole "SQL Server Basics" series here: https://www.youtube.com/playlist?list=PLU9JMEzjCv14f3cWDhubPaddxRvx1reKR Check my SQL blog at: http://sqlwithmanoj.com/ Check my SQL FB Page at: https://www.facebook.com/sqlwithmanoj
Views: 56847 SQL with Manoj
Select Sum, Distinct, In, Null on Oracle in telugu
 
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#KOTHA_ABHISHEK http://htmlintelugu1.blogspot.com http://cssintelugu1.blogspot.com http://javascriptintelugu1.blogspot.com http://sqlintelugu1.blogspot.com http://javaintelugu1.blogspot.com
Views: 502 KOTHA ABHISHEK
Performance difference between Count(*) and Count(1)
 
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Its being very confusing topic for me,I have decided to create video and share my knowledge with you guys.Please gives your feedback and suggestion.Thanks.
Views: 1078 SqlIsEasy
TUTORIAL-3 Select, functions like min, max, count, sum, avg in oracle database
 
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select, functions like min, max, count, sum, avg in oracle database. Demonstration of working on a table and data in it. Please like and subscribe us.
Views: 55 Let's Learn Pro
12 of 15 SQL Basics with Oracle - Aggregate (grouping) functions and the GROUP BY clause
 
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This video explains the GROUP BY clause and some of the aggregate functions: sum, count, average, maximum, minimum, count(distinct ...), etc. An example of using an aggregate function would be to group students by major and only show the number of students in each major, not individual student information. (12 of 15) There is also an "Advanced SQL" series. (Search for "databasemec" for tutorials using SQL Server.)
Views: 5424 Jennifer Kreie
SQL Tutorial 9: HAVING and DISTINCT clause
 
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HAVING clause is used to filter rows generated with a GROUP BY statement. It is an equivalent of WHERE. WHERE filters each row of the result generated; HAVING filters each row of the generated result. HAVING clause may include compound filter conditions just like on WHERE clause. You may only use HAVING clause if you have a GROUP BY in your SELECT statement. The video shows the on how an aggregate function COUNT is used in the example. Function YEAR() is also used as part of the HAVING filter condition. Examples show on how to group columns using GROUP BY with an aggregate function to generate the desired result. DISTINCT eliminates occurrence of same set of rows. On some occasions, you may use DISTINCT as a replacement for the GROUP BY clause. One example shows on how to use SELECT statement with a WHERE, ORDER BY, GROUP BY, HAVING clauses. As you become familiar with the syntax, it may offer a time-saving approach to generate the result you need. HAVING, WHERE, DISTINCT, COUNT, MAX and other aggregate functions are standard in all SQL DBMS products. It has the same syntax as you work with Informix, Oracle, MS SQL Server, MySQL, in addition to DB2. Link for the ebook will be announced later.
Views: 1347 Jerry Esperanza
Advanced Microsoft Access 2013 Tutorial | Selecting Unique And Distinct Values
 
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Want all of our free Microsoft Access training videos? Visit our Learning Library, which features all of our training courses and tutorials at http://learn.infiniteskills.com?utm_source=youtube&utm_medium=microsoft_access&utm_campaign=01870_0301 More details on this Advanced Microsoft Access 2013 training can be seen at http://www.infiniteskills.comadvanced-microsoft-access-2013-training.html/. This clip is one example from the complete course. For more free Microsoft tutorials please visit our main website. YouTube: https://www.youtube.com/user/OreillyMedia Facebook: https://www.facebook.com/OReilly/?fref=ts Twitter: https://twitter.com/OReillyMedia Website: http://www.oreilly.com/
Oracle Core, Лекция 8-1
 
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Ссылка на файл с презентацией: https://docs.google.com/presentation/d/196mOgO6TGT9CUK2RlOtNoGuS2y-bxG9A6pp8Jc9nasU/edit?usp=sharing (презентация может быть с анимацией) Ссылка на краткий конспект лекции: https://docs.google.com/document/d/1X8dIjwjUrmELNOHXgRo7_SmGio7h8eb9jDZmM1dvbKA/edit?usp=sharing 1. Типы коллекций в Oracle 2. Ассоциативный массив (index by table, pl/sql table) 3. Varray (varying array) 4. Вложенная таблица (nested table, table of) 5. Set operations (multiset union, multiset union distinct, multiset intersect, multiset intersect distinct, set, multiset except, multiset except distinct) 6. Логические операции с коллекциями в Oracle (in, submultiset of, member of, is a set, is empty) 7. Методы коллекций 8. Метод Delete (три перегруженных метода) 9. Метод Trim (два перегруженных метода) 10. Метод Extend (три перегруженных метода) 11. Метод Exists 12. Методы First и Last 13. Метод Count 14. Метод Limit 15. Методы Prior и Next 16. Операция Bulk Collect (select bulk collect into, fetch bulk collect into, returning bulk collect into) 17. Цикл forall (forall indices of, forall values of, sql%bulk_collect, sql%rowcount) 18. Обработка exceptions в цикле forall (save exceptions, ora-24381, sql%bulk_exceptions) 19. Возможные exceptions при работе с коллекциями (collection_is_null, no_data_found, subscript_beyond_count, subscript_outside_limit, value_error) 20. Метод dbms_session.free_unused_user_memory Oracle Database, БД Oracle, вебинар Oracle, презентация Oracle, урок Oracle, лекция Oracle, обучение Oracle
SQL Cơ Bản - Bài 5: GROUP BY and GROUP Functions
 
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Trong bài này, chúng ta sẽ học về: - Các Group Function trong Oracle: AVG, SUM, MIN, MAX, COUNT - Phân biệt các kiểu sử dung hàm count(*), count(ten_column), count(distinct ). - Sử dung mệnh đề GROUP BY để gom nhóm dữ lieu. - Sử dung mệnh đề HAVING để lọc lại dữ lieu sau khi đã GROUP BY.
Views: 5700 Database Tutorials

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