错误-我在此sql查询中做错了什么？

Question

我正在尝试使用特定条件从同一张表中更新表中的值，但该表未运行

我已经尝试过使用“ WITH”

update my_table as res1
set res1.my_column = (select res2.my_column from my_table as res2
                      where res2.parent_id is null and res2.is_company = true)
where res1.parent_id=res2.id;

Answer 1

只需尝试以下SQL：

update my_table as res1 set my_column = res2.my_column from my_table res2 where res1.parent_id = res2.id and res2.partner_id is null and res2.is_company;

Answer 2

您没有指定SQL Server的类型，但是通常SELECT的UPDATE需要特定的语法：

How do I UPDATE from a SELECT in SQL Server?