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如何将两个不同的表格连接起来并更新第二个表格?
原标题:How to link two different tables and update the second one?
  • 时间:2011-03-12 01:42:36
  •  标签:
  • mysql
  • sql

我有两个表:A和B。

Table A  .Birthday  .Name    .LastName
Table B  .Date      .Salary  .Rent

我需要写一个问题,即每个出生在(Birthday=)的人的工资增加10%。 页: 1

我不知道如何将这些表格连接起来,并更新表B。

问题回答

由于它们没有一个共同的一栏,因此不可能加入这些表格。

如同几位著名用户先前提到的那样,NEED PK in Table A and FK in Table B,否则不可能加入。 但是,要实际更新一个更好的 que点是:

Update b set b.Salary = b.Salary*1.1
From TableB b Inner Join TableA a On b.Id = a.Id
Where a.Birthday =  05/05/1977 

我先要把这两个表格联系起来。 在您的表格中创造出一个“id”的领域,并将这个领域作为表格中的主要重点。 之后,在你B桌上也创建了一个“id”作为外国钥匙的领域。 之后,你将能够写一下问话。

$q="select a_id from A where birthday= 05/05/1977 ";
$rs= mysql_query($q);
if($rs && mysql_num_rows($rs))
{
 whlile($rd=mysql_fetch_object($rs))
 {
  $q1="update B set salary=(salary*1.1) where aid=$rd->aid";
  $rs=mysql_query($q1);
 }
}




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