使用“选择查询"更新表.带有where子句

问题描述

我想实现以下目标:

表的当前状态(my_table)

 id        totalX          totalY          totalZ
 --------- --------------  --------------  --------------
         9             34              334             0
        10              6               56             0
        11             21              251             0
        12              3               93             0

(my_table2)的查询结果

select id,count(*) as total FROM my_table2 WHERE column_2 = 1 GROUP BY id

 id        total
 --------- --------------
         9            500
        10            600
        11            700
        12            800

表的预期状态(my_table)

 id        totalX          totalY          totalZ
 --------- --------------  --------------  --------------
         9             34              334             500
        10              6               56             600
        11             21              251             700
        12              3               93             800

可以在一个更新查询中完成吗?我正在RHEL 5.0上寻找Sybase ASE 12.5

Can this be done in ONE update query ? I am looking for Sybase ASE 12.5 on a RHEL 5.0

编辑:我找不到Sybase的解决方案，但是该问题的当前答案适用于MS SQL Server.

I coudn't find the solution for Sybase, but the current answer to the question works on MS SQL Server..

推荐答案

   update
          my_table
   set
      my_table.totalZ = t.total
   FROM
    my_table mt
    INNER JOIN
       (select id,count(*) as total
       FROM my_table2
      WHERE column_2 = 1 GROUP BY id) t
   on mt.id  = t.id

更新，这就是您要在MS SQL Server中执行的操作. OP指出这在Sybase中不起作用.

UPDATE In MS SQL Server this is what you would do. The OP noted this doesn't work in Sybase.

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