Question

我的表格report_business_likes包含相关字段：

id, facebook_id, created_at,  some_info
--  -----------  -----------  ----------
1    123456789   '2013-12-23'   blabla

我还有一个名为businesses的表，其结构如下：

id, fb_id,    data
--  -----     ----
33  123456789  xxx

我想在表report_business_likes中使用facebook_id替换id字段businesses。

在我的情况下，结果应该是：

id, facebook_id, created_at,  some_info
--  -----------  -----------  ----------
1    33          '2013-12-23'   blabla

如您所见，我将123456789替换为33。

我怎样才能做到这一点？

我试过了：

UPDATE `report_business_likes` SET facebook_id = BZ.id from 
  (select id from `businesses` where fb_id = 123456789 ) as BZ, 
   where  facebook_id = 123456789 AND date(created_at) = '2013-12-23';

但是语法错误：

[SQL] /*SELECT * FROM `report_business_likes` where facebook_id = 123456789 AND date(created_at) = '2013-12-23';*/

UPDATE `report_business_likes` SET facebook_id = BZ from 
(select id from `businesses` where fb_id = 123456789) as BZ, 
where  facebook_id = 123456789AND date(created_at) = '2013-12-23';
[Err] 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from 
(select id from `businesses` where fb_id = 123456789) as BZ,' at line 3

请帮忙，

Answer 1

UPDATE report_business_likes 
    SET facebook_id =   (select id 
                        from businesses  
                        where facebook_id = 123456789 )
 WHERE facebook_id = 123456789 AND date(created_at) = '2013-12-23'

OR

UPDATE RBL
SET RBL.facebook_id = B.id
FROM report_business_likes RBL INNER JOIN businesses B 
ON RBL.facebook_id = B.facebook_id

Answer 2

UPDATE report_business_likes r  JOIN businesses b  ON r.facebook_id=b.fb_id 
SET r.facebook_id=b.id

Answer 3

您正在尝试混合语法。 update的正确语法是：

update `Your table`
set `Field in yourTable` = `value or expression`
where `Conditions to filter the data in your table`

update子句的from语法中没有位置。

当然，如果你想用子查询的结果更新你的字段，你可以（参见M.Ali的回答）。

请查看reference manual。

Answer 4

您可以尝试以下方法：

Update set sb.facebook_id=b.id from 
report_business _likes rb join business b on r.facebook_id=b.fb_id

如何根据mySql中的另一个表更新字段值？

4 个答案: