Extracting partial records using GROUP BY. : GROUP BY « Query « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Query » GROUP BY 
1. 4. 4. Extracting partial records using GROUP BY.
4>
5>
6CREATE TABLE Classification (
7>      Classif_ID         integer  NOT NULL PRIMARY KEY,
8>      Classification    varchar(25))
9> 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>
2>
3SELECT CD.Classif_ID,Classification.Classification,
4>          Count(CD.CD_ID"Total Offerings"
5FROM CD,Classification
6WHERE CD.Classif_ID = Classification.Classif_ID and CD.SalesPrice >= 12.00
7> GROUP BY CD.Classif_ID,Classification.Classification
8> GO
Classif_ID   Classification            Total Offerings
----------- ------------------------- ---------------
          Pop                                    14
          Country                                 2
          Alternative                             3
          Metal                                   6

(rows affected)
1>
2> drop table Classification;
3> drop table CD;
4> GO
1. 4. GROUP BY
1. 4. 1. A summary query that counts the number of Billings by Banker
1. 4. 2. Group by and table join
1. 4. 3. A summary query with a search condition in the WHERE clause
1. 4. 4. Extracting partial records using GROUP BY.
1. 4. 5. GROUP BY with SUM()
1. 4. 6. both the EmployeeID and CustomerID columns in our GROUP BY
1. 4. 7. A count for each grouping rather than the full table
1. 4. 8. Using GROUP BY ALL
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