基本上我有这样的事情：

UPDATE

Table

SET

Table.col1 = other_table.col1,

FROM

Table

INNER JOIN

other_table

ON

Table.id = other_table.id

问题是我想用如下选择来更新col1：

SELECT SUM(col1) FROM other_table WHERE Table.id = other_table.id AND period > 2011

编辑

正确答案：

UPDATE bestall

INNER JOIN (SELECT bestid,SUM(view) as v,SUM(rawView) as rv

FROM beststat

WHERE period > 2011 GROUP BY bestid) as t1

ON bestall.bestid = t1.bestid

SET view = t1.v, rawview = t1.rv

解决方法:

您不能在set子句中直接使用聚合.解决该问题的一种方法是子查询：

update your_table as yt

left join

(

select id

, count(*) as cnt

from other_table

where period < 4

group by

id

) as ot

on yt.id = ot.id

set col1 = coalesce(ot.cnt,0)

标签：sql,mysql

来源： https://codeday.me/bug/20191201/2080765.html