Using the ROLLUP Operator : ROLLUP « Analytical Functions « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Analytical Functions » ROLLUP 
14. 8. 1. Using the ROLLUP Operator
ROLLUP with GROUP BY calculates all possible subtotals and totals in the GROUP BY clause from left to right.
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>
3>
4SELECT CD.Classif_ID,Classification.Classification,
5>        Count(CD.CD_ID"Total Offerings"
6FROM CD,Classification
7WHERE CD.Classif_ID = Classification.Classif_ID
8> GROUP BY Classification.Classification, CD.Classif_ID with ROLLUP
9> GO
Classif_ID   Classification            Total Offerings
----------- ------------------------- ---------------
          Alternative                             3
       NULL Alternative                             3
          Country                                 2
       NULL Country                                 2
          Metal                                   7
       NULL Metal                                   7
          Pop                                    19
       NULL Pop                                    19
       NULL NULL                                   31

(rows affected)
1>
2> drop table Classification;
3> drop table CD;
4> GO
14. 8. ROLLUP
14. 8. 1. Using the ROLLUP Operator
14. 8. 2. A summary query that includes a final summary row with 'WITH ROLLUP'
14. 8. 3. Group hierarchy using the ROLLUP operator is determined by the order in which the grouping columns are specified.
14. 8. 4. A summary query that includes a summary row for each grouping level
14. 8. 5. WITH ROLLUP for calculating subtotals and totals on the first column in the GROUP BY column list
14. 8. 6. Summarizing Data with ROLLUP
14. 8. 7. ROLLUP Returns Super Aggregation Only in One Direction
14. 8. 8. Using ROLLUP to Get the Order Count by Year and Month
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