Home Database Mysql Tutorial SQL with rollup 、with cube、grouping 统计函数用法

SQL with rollup 、with cube、grouping 统计函数用法

Jun 07, 2016 pm 02:56 PM
rollup sql with

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、 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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