SQL插入动态值

Question

我在postgres数据库上使用以下查询：

insert into user_settings (google_access_token, google_refresh_token) 
   select 'google_access_token', 'google_refresh_token' from user 
   where id = user_id

表user_settings有一个字段user_id ，它对应于用户表中名为id字段。 但这给出了错误：

column "user_id" does not exist 
Hint: There is a column named "user_id" in table "user_settings", 
but it cannot be referenced from this part of the query

Answer 1

我想你需要这样做：

   insert into user_settings (google_access_token, google_refresh_token) 
   select 'google_access_token', 
          'google_refresh_token' 
   from user 
   where id in (select user_id from user_settings )

Answer 2

您正在user_settings中的一列并有条件地插入到该表中。 我认为您必须使用update语句，因为您的条件是

用户.id =用户设置.user_id

Answer 3

即使您没有匹配的值，也可以用空值更新表

update user_settings
set 
user_settings.google_access_token='google_access_token',
user_settings.google_refresh_token='google_refresh_token'
from user_settings
inner join user 
on user_settings.user_id=user.id