MySQL更新时Error Code:1093和Error Code:1175的解决办法
Error Code: 1093. You can't specify target table 'ws_product' for update in FROM clause
這個是我們在使用update或者delete語句時,在where條件里面加入的子查詢導致的。例如如下的update語句:
update table set type = 'static' where id in (
select id from ws_product where first_name ='superman'
);
修改上述語句為下面這樣,該問題可以解決:
update ws_product set type = 'static' where id in (
select id form (
?select id from ws_product where first_name ='superman'
) xx
);
注意,這樣一定要給最里面的子查詢定義一個別名,不然會報另外一個錯誤:
Error Code: 1248. Every derived table must have its own alias
Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Queries and reconnect.
解決辦法是在當前session下執行如下的語句
SET SQL_SAFE_UPDATES = 0;
然后再執行Update語句
?
總結
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