在mysql中执行计算

Question

亲爱的所有..我在DB上有一些数据。

name        Range
bla     123x9901-123x0000      //it means range 9901 until 10000 = 100
bla     123v0001-123v0100      // 10001-10100 = 100

我想要的结果如下：

   name         Qty  
   bla          200

我指望他们使用：

SELECT................
      IF(RIGHT(Range,4) = "0000",10000,RIGHT(Range,4)) - MID(Range,5,4) + 1 AS Qty
FROM mytable GROUP BY name;

但结果是：

name      Qty
bla       100

Answer 1

使用：

  SELECT name,
         SUM(IF(RIGHT(Range,4) = "0000",10000, RIGHT(Range,4)) - MID(Range,5,4) + 1) AS Qty
    FROM mytable
GROUP BY name;

...给我：

name    Qty  
-------------
bla     200