MySQL資料庫更新時Error Code:1093和Error Code:1175的解決辦法

MySQL更新時Error Code:1093和Error Code:1175的解決辦法

 

MySQLSQL

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條件裡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
);

 

 

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;

 

然後再執行Update語句

 

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