mysql有rollup函数,Mysql,Oracle使用rollup函数完成行列统计

时间 2014-02-25 00:05:38 ITeye-博客

昨天突然在一篇博客中看到了Mysql也有rollup函数，原博文使用了rollup进行行列统计，原博文链接如下：

本博文主要是记录下mysql和oracle使用rollup函数进行行列统计，内容比较简单。

首先是mysql，建表测试：

CREATE TABLE `tmysql_test_hanglietongji` (

`id` int(11) NOT NULL,

`c1` char(2) COLLATE utf8_bin DEFAULT NULL,

`c2` char(2) COLLATE utf8_bin DEFAULT NULL,

`c3` int(11) DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin

INSERT INTO `tmysql_test_hanglietongji` VALUES (1, ‘A1‘, ‘B1‘, 9);

INSERT INTO `tmysql_test_hanglietongji` VALUES (2, ‘A2‘, ‘B1‘, 7);

INSERT INTO `tmysql_test_hanglietongji` VALUES (3, ‘A3‘, ‘B1‘, 4);

INSERT INTO `tmysql_test_hanglietongji` VALUES (4, ‘A4‘, ‘B1‘, 2);

INSERT INTO `tmysql_test_hanglietongji` VALUES (5, ‘A1‘, ‘B2‘, 2);

INSERT INTO `tmysql_test_hanglietongji` VALUES (6, ‘A2‘, ‘B2‘, 9);

INSERT INTO `tmysql_test_hanglietongji` VALUES (7, ‘A3‘, ‘B2‘, 8);

INSERT INTO `tmysql_test_hanglietongji` VALUES (8, ‘A4‘, ‘B2‘, 5);

INSERT INTO `tmysql_test_hanglietongji` VALUES (9, ‘A1‘, ‘B3‘, 1);

INSERT INTO `tmysql_test_hanglietongji` VALUES (10, ‘A2‘, ‘B3‘, 8);

INSERT INTO `tmysql_test_hanglietongji` VALUES (11, ‘A3‘, ‘B3‘, 8);

INSERT INTO `tmysql_test_hanglietongji` VALUES (12, ‘A4‘, ‘B3‘, 6);

INSERT INTO `tmysql_test_hanglietongji` VALUES (13, ‘A1‘, ‘B4‘, 8);

INSERT INTO `tmysql_test_hanglietongji` VALUES (14, ‘A2‘, ‘B4‘, 2);

INSERT INTO `tmysql_test_hanglietongji` VALUES (15, ‘A3‘, ‘B4‘, 6);

INSERT INTO `tmysql_test_hanglietongji` VALUES (16, ‘A4‘, ‘B4‘, 9);

INSERT INTO `tmysql_test_hanglietongji` VALUES (17, ‘A1‘, ‘B4‘, 3);

INSERT INTO `tmysql_test_hanglietongji` VALUES (18, ‘A2‘, ‘B4‘, 5);

INSERT INTO `tmysql_test_hanglietongji` VALUES (19, ‘A3‘, ‘B4‘, 2);

INSERT INTO `tmysql_test_hanglietongji` VALUES (20, ‘A4‘, ‘B4‘, 5);

要完成的效果如下：

最简单的是使用union,如下：

select ifnull(c1, ‘total‘) as ‘total‘,

sum(if(c2 = ‘B1‘, C3, 0)) AS B1,

sum(if(c2 = ‘B2‘, C3, 0)) AS B2,

sum(if(c2 = ‘B3‘, C3, 0)) AS B3,

sum(if(c2 = ‘B4‘, C3, 0)) AS B4,

SUM(C3) AS TOTAL

from tmysql_test_hanglietongji

group by C1

union

select ‘total‘ as ‘total‘,

sum(if(c2 = ‘B1‘, C3, 0)) AS B1,

sum(if(c2 = ‘B2‘, C3, 0)) AS B2,

sum(if(c2 = ‘B3‘, C3, 0)) AS B3,

sum(if(c2 = ‘B4‘, C3, 0)) AS B4,

SUM(C3) AS TOTAL

from tmysql_test_hanglietongji

order by 1

也可以使用with rollup函数。注意当使用 rollup时, 你不能同时使用 order by子句进行结果排序

select ifnull(c1, ‘total‘) ‘total‘,

sum(if(c2 = ‘B1‘, C3, 0)) AS B1,

sum(if(c2 = ‘B2‘, C3, 0)) AS B2,

sum(if(c2 = ‘B3‘, C3, 0)) AS B3,

sum(if(c2 = ‘B4‘, C3, 0)) AS B4,

SUM(C3) AS TOTAL

from tmysql_test_hanglietongji

group by C1 with rollup;

with rollup其实是第一个的简化。

也可以这样写：

SELECT IFNULL(c1, ‘total‘) AS total,

SUM(IF(c2 = ‘B1‘, c3, 0)) AS B1,

SUM(IF(c2 = ‘B2‘, c3, 0)) AS B2,

SUM(IF(c2 = ‘B3‘, c3, 0)) AS B3,

SUM(IF(c2 = ‘B4‘, c3, 0)) AS B4,

SUM(IF(c2 = ‘total‘, c3, 0)) AS total

FROM (SELECT c1, IFNULL(c2, ‘total‘) AS c2, SUM(c3) AS c3

FROM tmysql_test_hanglietongji

GROUP BY c1, c2 WITH ROLLUP

HAVING c1 IS NOT NULL) AS A

GROUP BY c1 WITH ROLLUP;

HAVING c1 IS NOT NULL条件主要是过滤掉对整个tmysql_test_hanglietongji 表求和的那一行，以上面的子查询为例：

SELECT c1, IFNULL(c2, ‘total‘) AS c2, SUM(c3) AS c3

FROM tmysql_test_hanglietongji

GROUP BY c1, c2 WITH ROLLUP

结果是：

相当于：

SELECT c1, IFNULL(c2, ‘total‘) AS c2, SUM(c3) AS c3

FROM tmysql_test_hanglietongji

GROUP BY c1, c2

union ALL

SELECT c1, ‘total‘ AS c2, SUM(c3) AS c3

FROM tmysql_test_hanglietongji

GROUP BY c1

union ALL

SELECT NULL, ‘total‘ AS c2, SUM(c3) AS c3

FROM tmysql_test_hanglietongji

结果是：

可以看出group by c1,c2 with rollup相当于group by c1,c2 union group by c1(c2替换为NULL) union (c1,c2全部替换为NULL)。

这里的替换规则参考了链接

原文是替换Oracle的rollup，在Mysql中也适用。

使用普通sql写法是：

SELECT IFNULL(c1, ‘total‘) AS total,

SUM(IF(c2 = ‘B1‘, c3, 0)) AS B1,

SUM(IF(c2 = ‘B2‘, c3, 0)) AS B2,

SUM(IF(c2 = ‘B3‘, c3, 0)) AS B3,

SUM(IF(c2 = ‘B4‘, c3, 0)) AS B4,

SUM(IF(c2 = ‘total‘, c3, 0)) AS total

FROM (SELECT c1, IFNULL(c2, ‘total‘) AS c2, SUM(c3) AS c3

FROM tmysql_test_hanglietongji

GROUP BY c1, c2

HAVING c1 IS NOT NULL

union

SELECT c1, ‘total‘ as c2, SUM(c3) AS c3

FROM tmysql_test_hanglietongji

group by c1) A

group by c1

UNION

SELECT ‘total‘ as total,

SUM(IF(c2 = ‘B1‘, c3, 0)) AS B1,

SUM(IF(c2 = ‘B2‘, c3, 0)) AS B2,

SUM(IF(c2 = ‘B3‘, c3, 0)) AS B3,

SUM(IF(c2 = ‘B4‘, c3, 0)) AS B4,

SUM(IF(c2 = ‘total‘, c3, 0)) AS total

FROM (SELECT c1, IFNULL(c2, ‘total‘) AS c2, SUM(c3) AS c3

FROM tmysql_test_hanglietongji

GROUP BY c1, c2

HAVING c1 IS NOT NULL

union

SELECT c1, ‘total‘ as c2, SUM(c3) AS c3

FROM tmysql_test_hanglietongji

group by c1) A

少了一个是因为上面的having要求c1 is not null,所以替换c1为NULL就没有了。

下面看下oracle中怎么写，想要的效果如图：

首先建表。

create table TSQL_TEST_HANGLIETONGJI

(

ID NUMBER(4) not null,

C1 VARCHAR2(2),

C2 VARCHAR2(2),

C3 NUMBER(4)

)

;

alter table TSQL_TEST_HANGLIETONGJI

add primary key (ID);