Using the GROUP BY Clause : Table Join « Table Join « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Table Join » Table Join 
4. 1. 5. Using the GROUP BY Clause
4>
5CREATE TABLE Classification (
6>      Classif_ID         integer  NOT NULL PRIMARY KEY,
7>      Classification    varchar(25))
8> GO
1>
2INSERT into Classification VALUES1,"Pop")
3INSERT into Classification VALUES2,"Country")
4INSERT into Classification VALUES3,"Alternative")
5INSERT into Classification VALUES4,"Metal")
6> GO

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1>
2>
3CREATE TABLE CD (
4>      CD_ID              integer  NOT NULL PRIMARY KEY,
5>      CD_Title           varchar(40),
6>      Composer_ID        integer  NOT NULL,
7>      Classif_ID         integer  NOT NULL,
8>      SalesPrice        money,
9>      AverageCost       money)
10> GO
1INSERT into CD VALUES(2000,"John",100,1,16.99,6.99)
2INSERT into CD VALUES(2001,"Chicago 16",107,1,14.99,5.99)
3INSERT into CD VALUES(2002,"Chicago 17",107,1,14.99,5.99)
4INSERT into CD VALUES(2003,"Chicago 18",107,1,14.99,5.99)
5INSERT into CD VALUES(2004,"Greatest Hits",107,1,16.99,7.99)
6INSERT into CD VALUES(2005,"Midnight",101,3,14.99,5.99)
7INSERT into CD VALUES(2006,"Mode",115,3,14.99,5.99)
8INSERT into CD VALUES(2007,"Ultra",115,3,15.99,5.99)
9INSERT into CD VALUES(2008,"Mindcrime",102,4,14.99,5.99)
10INSERT into CD VALUES(2009,"Empire",102,4,14.99,5.99)
11INSERT into CD VALUES(2010,"Land",102,4,12.99,4.99)
12INSERT into CD VALUES(2011,"Night",103,4,11.99,3.99)
13INSERT into CD VALUES(2012,"Pyromania",103,4,14.99,5.99)
14INSERT into CD VALUES(2013,"Hysteria",103,4,14.99,5.99)
15INSERT into CD VALUES(2014,"Hits",103,4,13.99,4.99)
16INSERT into CD VALUES(2015,"Hits 2",104,2,15.99,6.99)
17INSERT into CD VALUES(2016,"Greatest",105,2,14.99,5.99)
18INSERT into CD VALUES(2017,"Hits 3",106,1,13.99,5.99)
19INSERT into CD VALUES(2018,"Deep",108,1,12.99,2.99)
20INSERT into CD VALUES(2019,"Turning",109,1,14.99,5.99)
21INSERT into CD VALUES(2020,"TheHits",109,1,16.99,7.99)
22INSERT into CD VALUES(2021,"Cars",110,1,9.99,3.99)
23INSERT into CD VALUES(2022,"Anthology",110,1,25.99,11.99)
24INSERT into CD VALUES(2023,"City",110,1,14.99,5.99)
25INSERT into CD VALUES(2024,"Rick",111,1,11.99,2.99)
26INSERT into CD VALUES(2025,"Live",112,1,19.99,8.99)
27INSERT into CD VALUES(2026,"Pat",113,1,16.99,6.99)
28INSERT into CD VALUES(2027,"Big",114,1,14.99,5.99)
29INSERT into CD VALUES(2028,"Hurting",114,1,11.99,3.99)
30INSERT into CD VALUES(2029,"Vol 1",116,1,9.99,2.99)
31INSERT into CD VALUES(2030,"Vol 2",116,1,9.99,2.99)
32> GO

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1>
2SELECT CD.Classif_ID,Classification.Classification,
3>          Count(CD.CD_ID"Total Offerings"
4>     FROM CD,Classification
5>          WHERE CD.Classif_ID = Classification.Classif_ID
6>               GROUP BY CD.Classif_ID,Classification.Classification
7> GO
Classif_ID   Classification            Total Offerings
----------- ------------------------- ---------------
          Pop                                    19
          Country                                 2
          Alternative                             3
          Metal                                   7

(rows affected)
1>
2>
3> drop table Classification;
4> drop table CD;
5> GO
4. 1. Table Join
4. 1. 1. SQL Server 2005 join types fall into three categories: inner, outer, and cross.
4. 1. 2. Selecting authors and titles using only joins.
4. 1. 3. A SELECT statement that joins the Bankers and Billings tables
4. 1. 4. Joining Tables in the WHERE Clause (not ANSI standard)
4. 1. 5. Using the GROUP BY Clause
4. 1. 6. Joining three tables.
4. 1. 7. Joins and Subqueries
4. 1. 8. Left and Right Outer Joins
4. 1. 9. Joining Tables in the FROM Clause (ANSI standard)
4. 1. 10. Table Aliasing
4. 1. 11. Join tables with two columns
4. 1. 12. The result of the previous join is then joined to another table
4. 1. 13. SQL-92 Three-Way Inner Joins
4. 1. 14. Forcing the Order of Join Processing
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