php - mysql如果列包含

Question

我有一个包含这样数据的表(表 A)

id | key  | status
-----------------
1  | dg12 | done
2  | dg12 | 

像这样(表B)

id   | Name  | status
------------------
dg12 | Dummy | 

我想用这个条件更新表B的状态

如果表 A 第 1 行和第 2 行中的状态(我的意思是不包含“”值)已完成，则表 B 中的 dg12 状态已完成...

我该怎么做？？使用php + mysql，任何人都可以帮忙吗？？ 先谢谢

Answer 1

UPDATE 
    tableB AS b
SET 
    b.status = 'done'
WHERE 
    (SELECT COUNT(*) FROM tableA AS a WHERE a.key = b.id) 
    = 
    (SELECT COUNT(*) FROM tableA AS a WHERE a.key = b.id AND a.status = 'done')

或

UPDATE 
    tableB AS b
SET 
    b.status = 'done'
WHERE 
    (SELECT COUNT(*) FROM tableA AS a WHERE a.key = b.id AND a.status != 'done') = 0