mysql SQL语句You can't specify target table ' for update in FROM clause解决

DELETE
FROM
bd_country
WHERE
id IN (
SELECT
id
FROM
bd_country
WHERE
statecode IS NULL
AND citycode IS NULL
AND nameCN IS NULL
)

然后出现了  [Err] 1093 - You can't specify target table 'bd_country' for update in FROM clause的错误，当时很纳闷 一直这样写的怎么会出现问题呢，它的意思是（你不能在FROM子句指定目标表更新），我想了想是不是以前我一直用的Oracle，Oracle可以但是Mysql不可以。

解决思路：既然Mysql不让对查询到的目标语句进行更新，那么我在它的上面在套一个子查询就可以。

DELETE
FROM
bd_country
WHERE
id IN (
SELECT
tmp.id
FROM
(
SELECT
id
FROM
bd_country
WHERE
statecode IS NULL
AND citycode IS NULL
AND nameCN IS NULL
) tmp
)

DELETE
FROM
bd_country
WHERE
id IN (
SELECT
id
FROM
bd_country
WHERE
statecode IS NULL
AND citycode IS NULL
AND nameCN IS NULL
)

然后出现了  [Err] 1093 - You can't specify target table 'bd_country' for update in FROM clause的错误，当时很纳闷 一直这样写的怎么会出现问题呢，它的意思是（你不能在FROM子句指定目标表更新），我想了想是不是以前我一直用的Oracle，Oracle可以但是Mysql不可以。

解决思路：既然Mysql不让对查询到的目标语句进行更新，那么我在它的上面在套一个子查询就可以。

DELETE
FROM
bd_country
WHERE
id IN (
SELECT
tmp.id
FROM
(
SELECT
id
FROM
bd_country
WHERE
statecode IS NULL
AND citycode IS NULL
AND nameCN IS NULL
) tmp
)