Question

以下是我的查询和相关错误。我做错了什么？

update aaalogin 
  set name = 
      ( select aaacontactinfo.emailid 
        from aaacontactinfo 
        WHERE aaalogin.user_id = aaausercontactinfo.user_id 
          and aaausercontactinfo.contactinfo_id = aaacontactinfo.contactinfo_id
      );

我得到了

错误：'where子句'中的未知列'aaausercontactinfo.user_id'

Answer 1

aaausercontactinfo未包含在FROM表格列表中，请尝试使用：

UPDATE aaalogin SET name =
(
    SELECT aaacontactinfo.emailid
    FROM aaacontactinfo, aaalogin, aaausercontactinfo
    WHERE aaalogin.user_id = aaausercontactinfo.user_id
    AND aaausercontactinfo.contactinfo_id = aaacontactinfo.contactinfo_id
);

Answer 2

试

UPDATE aaalogin SET name =
(
    SELECT aaacontactinfo.emailid
    FROM aaacontactinfo, aaausercontactinfo
    WHERE aaalogin.user_id = aaausercontactinfo.user_id
    AND aaausercontactinfo.contactinfo_id = aaacontactinfo.contactinfo_id
);

子查询中不需要aaalogin。如果使用它甚至可以在子查询中返回多个记录。

使用嵌套查询进行更新

2 个答案: