SQL with rollup 、with cube、grouping 统计函数用法
with rollup 、 with cube、 grouping CUBE 和 ROLLUP 之间的区别在于: CUBE 生成的结果集显示了所选列中值的所有组合的聚合。 ROLLUP 生成的结果集显示了所选列中值的某一层次结构的聚合。 grouping : 当用 CUBE 或 ROLLUP 运算符添加行时,附加的列输出值
with rollup 、 with cube、 groupingCUBE 和 ROLLUP 之间的区别在于:
CUBE 生成的结果集显示了所选列中值的所有组合的聚合。
ROLLUP 生成的结果集显示了所选列中值的某一层次结构的聚合。
grouping :
当用 CUBE 或 ROLLUP 运算符添加行时,附加的列输出值为1,当所添加的行不是由 CUBE 或 ROLLUP 产生时,附加列值为0。
-- 例如
DECLARE @T TABLE (名称 VARCHAR ( 1 ) , 出版商 VARCHAR ( 10 ), 价格1 INT , 价格2 INT )
INSERT @T
SELECT ' a ' , ' 北京 ' , 11 , 22 UNION ALL
SELECT ' a ' , ' 四川 ' , 22 , 33 UNION ALL
SELECT ' b ' , ' 四川 ' , 12 , 23 UNION ALL
SELECT ' b ' , ' 北京 ' , 10 , 20 UNION ALL
SELECT ' b ' , ' 昆明 ' , 20 , 30
SELECT
名称,
出版商,
SUM (价格1) AS 价格1,
SUM (价格2) AS 价格2,
GROUPING (名称) AS CHECK名称,
GROUPING (出版商) AS CHECK出版商
FROM @T GROUP BY 名称,出版商 WITH CUBE
/*
名称 出版商 价格1 价格2 CHECK名称 CHECK出版商
---- ---------- ----------- ----------- ------- --------
a 北京 11 22 0 0
a 四川 22 33 0 0
a NULL 33 55 0 1
b 北京 10 20 0 0
b 昆明 20 30 0 0
b 四川 12 23 0 0
b NULL 42 73 0 1
NULL NULL 75 128 1 1
NULL 北京 21 42 1 0
NULL 昆明 20 30 1 0
NULL 四川 34 56 1 0
(所影响的行数为 11 行)
*/
-- 分析
/* group by 两列:名称有两个类别A,B;所有由CUBE运算而生成行的是
名称 出版商 价格1 价格2 CHECK名称 CHECK出版商
---- ---------- ----------- ----------- ------- --------
a NULL 33 55 0 1
b NULL 42 73 0 1
出版商有三个类别,所有由CUBE运算而生成行的是
名称 出版商 价格1 价格2 CHECK名称 CHECK出版商
---- ---------- ----------- ----------- ------- --------
NULL 北京 21 42 1 0
NULL 昆明 20 30 1 0
NULL 四川 34 56 1 0
以及
NULL NULL 75 128 1 1
*/
SELECT
名称,
出版商,
SUM (价格1) AS 价格1,
SUM (价格2) AS 价格2
FROM @T GROUP BY 名称,出版商 WITH ROLLUP
/*
名称 出版商 价格1 价格2
---- ---------- ----------- -----------
a 北京 11 22
a 四川 22 33
a NULL 33 55
b 北京 10 20
b 昆明 20 30
b 四川 12 23
b NULL 42 73
NULL NULL 75 128
*/
DECLARE @T TABLE(名称 VARCHAR(1) , 出版商 VARCHAR(10), 价格1 INT, 价格2 INT) INSERT @T SELECT 'a', '北京', 11, 22 UNION ALL SELECT 'a', '四川', 22, 33 UNION ALL SELECT 'b', '四川', 12, 23 UNION ALL SELECT 'b', '北京', 10, 20 UNION ALL SELECT 'b', '昆明', 20, 30 SELECT 名称, 出版商, SUM(价格1) AS 价格1, SUM(价格2) AS 价格2, GROUPING(名称) AS CHECK名称, GROUPING(出版商) AS CHECK出版商 FROM @T GROUP BY 名称,出版商 WITH CUBE SELECT 名称, 出版商, SUM(价格1) AS 价格1, SUM(价格2) AS 价格2 FROM @T GROUP BY 名称,出版商 WITH ROLLUP

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