Mysql 我的SQL代码中的错误在哪里？

SQL命令：

UPDATE table1
SET colOne=1
WHERE id EXISTS (
SELECT IF(col1=19,col2,col1) AS id
FROM table2 
WHERE
(col3=19 AND col4='X') 
OR 
(col3=0 AND col4='Y' AND (col1=19 OR col2=19))
)

---

内部

选择

查询单独工作正常

您的意思是使用=而不是exists吗

UPDATE table1
SET colOne=1
WHERE id = (
SELECT IF(col1=19,col2,col1) AS id
FROM table2 
WHERE
(col3=19 AND col4='X') 
OR 
(col3=0 AND col4='Y' AND (col1=19 OR col2=19))
)

你也可以这样做

UPDATE table1
SET colOne=1
WHERE EXISTS (
SELECT IF(col1=19,col2,col1) AS id
FROM table2 
WHERE
(col3=19 AND col4='X') 
OR 
(col3=0 AND col4='Y' AND (col1=19 OR col2=19))
)

---

您的查询有什么不正确？我不知道，但它不起作用，并且在@中用

替换
存在的
时出现了一个错误
UPDATE table1
SET colOne=1
WHERE EXISTS (
SELECT IF(col1=19,col2,col1) AS id
FROM table2 
WHERE
(col3=19 AND col4='X') 
OR 
(col3=0 AND col4='Y' AND (col1=19 OR col2=19))
)