SQL SERVER 2008的Grouping sets的用法

CREATE TABLE Sales (EmpId INT, Yr INT, Sales MONEY)

INSERT Sales VALUES(1, 2005, 12000)

INSERT Sales VALUES(1, 2006, 18000)

INSERT Sales VALUES(1, 2007, 25000)

INSERT Sales VALUES(2, 2005, 15000)

INSERT Sales VALUES(2, 2006, 6000)

INSERT Sales VALUES(3, 2006, 20000)

INSERT Sales VALUES(3, 2007, 24000)

SELECT EmpId, Yr, SUM(Sales) AS Sales FROM Sales GROUP BY EmpId, Yr WITH ROLLUP

SELECT EmpId, Yr, SUM(Sales) AS Sales FROM Sales GROUP BY EmpId, Yr WITH CUBE

SELECT EmpId, Yr, SUM(Sales) AS Sales FROM Sales GROUP BY GROUPING SETS((EmpId, Yr), (EmpId), ())

EmpId       Yr          Sales
----------- ----------- ---------------------
1           2005        12000.00
1           2006        18000.00
1           2007        25000.00
1           NULL        55000.00
2           2005        15000.00
2           2006        6000.00
2           NULL        21000.00
3           2006        20000.00
3           2007        24000.00
3           NULL        44000.00
NULL        NULL        120000.00

SELECT EmpId, Yr, SUM(Sales) AS Sales FROM Sales GROUP BY GROUPING SETS((EmpId, Yr), (EmpId), (Yr), ())

EmpId       Yr          Sales
----------- ----------- ---------------------
1           2005        12000.00
2           2005        15000.00
NULL        2005        27000.00
1           2006        18000.00
2           2006        6000.00
3           2006        20000.00
NULL        2006        44000.00
1           2007        25000.00
3           2007        24000.00
NULL        2007        49000.00
NULL        NULL        120000.00
1           NULL        55000.00
2           NULL        21000.00
3           NULL        44000.00

SELECT EmpId, Yr, SUM(Sales) AS Sales FROM Sales GROUP BY GROUPING SETS((EmpId, Yr), (EmpId))

EmpId       Yr          Sales
----------- ----------- ---------------------
1           2005        12000.00
1           2006        18000.00
1           2007        25000.00
1           NULL        55000.00
2           2005        15000.00
2           2006        6000.00
2           NULL        21000.00
3           2006        20000.00
3           2007        24000.00
3           NULL        44000.00

SELECT EmpId, Yr, SUM(Sales) AS Sales FROM Sales GROUP BY GROUPING SETS((EmpId, Yr), ())

EmpId       Yr          Sales
----------- ----------- ---------------------
1           2005        12000.00
1           2006        18000.00
1           2007        25000.00
2           2005        15000.00
2           2006        6000.00
3           2006        20000.00
3           2007        24000.00
NULL        NULL        120000.00

SELECT EmpId, Yr, SUM(Sales) AS Sales FROM Sales GROUP BY GROUPING SETS((EmpId), (Yr))

EmpId       Yr          Sales
----------- ----------- ---------------------
NULL        2005        27000.00
NULL        2006        44000.00
NULL        2007        49000.00
1           NULL        55000.00
2           NULL        21000.00
3           NULL        44000.00

SELECT EmpId, Yr, SUM(Sales) AS Sales FROM Sales GROUP BY GROUPING SETS((EmpId, Yr))

EmpId       Yr          Sales
----------- ----------- ---------------------
1           2005        12000.00
2           2005        15000.00
1           2006        18000.00
2           2006        6000.00
3           2006        20000.00
1           2007        25000.00
3           2007        24000.00