UPDATE bbs_forum_forum AS ff,(SELECT fid,NAME FROM bbs_forum_forum) AS f SET ff.fup=f.fid
WHERE ff.parent_forum=f.name AND ff.parent_forum IS NOT NULL AND ff.parent_forum <> ''
mysql 同一表中更新
test 表格
有2个列
id int PK
name varchar(50)
orgId int FK
要把name列设置为某个复杂条件的 id 列的值,比如orgId=1
update test t set name=(select id from test where orgId=1 and id=t.id)
直接执行出现这个异常
错误：You can't specify target table 't' for update in FROM clause
修正方式如下
update test t, (select id,name from test where orgId=1) t2 set t.name=t2.id where t2.id=t.id
