更新表与其他表值

Question

我有2个表department_referance，department_referance中具有代码的部门等于部门表中的department_string_id。

department_referance //table 
id code sl_flag 
    DD01 1 

department //table 
department_id department_string_id sl_flag 
       DD01 

我想从department_referance中提取sl_flag值并更新部门表的sl_flag中的值。

update sl_flag='(SELECT a.sl_flag FROM department_referance a inner JOIN department b on a.code=b.department_string_id)' 

Answer 1

您可以使用此查询

UPDATE department d 
join department_referance 
dr on dr.code = d.department_string_id 
set d.sl_flag = dr.sl_flag 

Answer 2

您可以通过加入（JOIN）两个表来更新它。

查询

update `department ` t1 
join `department_referance ` t2 
on t1.`code` = t2.`department_string_id` 
set t1.`sl_flag` = t2.`sl_flag`;