SQL查询中的多个和

Question

SELECT sum( plot_status = 'OPEN' ) AS OPEN 
     , sum( plot_status = 'SOLD' ) AS SOLD
FROM `tbl_plot`
GROUP BY `plot_status

这是给予

OPEN   SOLD
7       0
0       8

如何制作

OPEN  SOLD
7      8

或者可能吗？

Answer 1

只需删除GROUP BY子句即可。

SELECT sum( plot_status = 'OPEN' ) AS `OPEN` ,
       sum( plot_status = 'SOLD' ) AS SOLD
FROM  `tbl_plot`

Answer 2

如果存在plot_name或id，则按其分组，而不是plot_status：

SELECT sum( plot_status = 'OPEN' ) AS
OPEN , sum( plot_status = 'SOLD' ) AS SOLD
FROM `tbl_plot`
GROUP BY //`plot_name or plot_id

这对你个人情节有用。 如果您不想这样，那么删除group by子句。

Answer 3

选择*来自 （ 选择总和（plot_status ='OPEN'FROM tbl_plot）AS OPEN 选择总和（plot_status ='已售出来自tbl_plot）已售出 ）TBL