Question

我对mysql sum（）结果有一个奇怪的问题。

SELECT  `users_limits`.times, SUM( l.times ) AS  `result` 
    FROM  `users_limits` 
      INNER JOIN  `users_limits` AS  `l` 
      INNER JOIN  `vacation_types` AS  `v` ON l.id_vacation_type = v.id_vacation_type
   WHERE  l.year =2014 AND v.type =0

此查询给我结果：次= 10; 结果= 30;

但是也应该给我结果10，因为我的数据库中只有一条记录，具有这些条件。

Answer 1

你需要GROUP BY。尝试添加此

 GROUP BY  l.times

像那样

   WHERE l.year =2014 AND v.type =0
   GROUP BY  l.times

编辑 - ：

  SELECT  `users_limits`.times, SUM( l.times ) AS  `result` 
  FROM  `users_limits` l
  INNER JOIN  `vacation_types` AS  `v` ON l.id_vacation_type = v.id_vacation_type
  WHERE l.year =2014 AND v.type =0
  GROUP BY  l.times

奇怪的SUM（）结果

1 个答案: