mysql - SQL查询中的多重求和

Question

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

这是给

OPEN   SOLD
7       0
0       8

如何制作

OPEN  SOLD
7      8

或者有可能吗？

Answer 1

只需删除该GROUP BY子句，它就会起作用。

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

Answer 2

select * from (select sum(plot_status = 'OPEN' FROM tbl_plot) AS OPEN select sum(plot_status = 'SOLD' FROM tbl_plot) As Sold)tbl

Answer 3

如果存在 plot_name 或 id，则按其分组，而不是按 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

这将适用于您的个人情节。如果您不希望这样，请删除 group by 子句。