如何将select的结果用于同一个select

Question

有一种方法可以将选择结果用于同一个选择吗？

这样的东西？

选择10作为数字，（数字/ 2）作为一半FROM表

泰

EDIT //////////

好的，这是真正的交易。

SELECT * FROM (SELECT 
(SUM(
CASE 
      WHEN JVB0 = 1 AND JHIT0 = 0 AND JER0 = ' ' THEN '1' 
                WHEN JVB0 = 1 AND JHIT0 = 0 AND JER0 = '' THEN '1' 
                WHEN JVB0 = 1 AND JSF0 = 1 AND JSH0 = 1 THEN '1' 
      ELSE 0 
END)+   
SUM(CASE  
                WHEN JDP0 = 1 OR JDP0 = 2 THEN '2' 
                WHEN JDP0 = 3 OR JDP0 = 4 THEN '3' 
                WHEN JOR0 = 1 THEN '1'
                WHEN JACTB0 != '' THEN '1'
      ELSE 0 
END)) as tercios_thrown,

我必须把tercios_thrown的结果和一个使用tercios_thrown作为主号码的公式。所以我认为，如果不这样做可能是另一种方式：

SELECT * FROM (SELECT 
(SUM(
CASE 
      WHEN JVB0 = 1 AND JHIT0 = 0 AND JER0 = ' ' THEN '1' 
                WHEN JVB0 = 1 AND JHIT0 = 0 AND JER0 = '' THEN '1' 
                WHEN JVB0 = 1 AND JSF0 = 1 AND JSH0 = 1 THEN '1' 
      ELSE 0 
END)+   
SUM(CASE  
                WHEN JDP0 = 1 OR JDP0 = 2 THEN '2' 
                WHEN JDP0 = 3 OR JDP0 = 4 THEN '3' 
                WHEN JOR0 = 1 THEN '1'
                WHEN JACTB0 != '' THEN '1'
      ELSE 0 
END)) as tercios_thrown,

((SUM(
CASE 
      WHEN JVB0 = 1 AND JHIT0 = 0 AND JER0 = ' ' THEN '1' 
                WHEN JVB0 = 1 AND JHIT0 = 0 AND JER0 = '' THEN '1' 
                WHEN JVB0 = 1 AND JSF0 = 1 AND JSH0 = 1 THEN '1' 
      ELSE 0 
END)+   
SUM(CASE  
                WHEN JDP0 = 1 OR JDP0 = 2 THEN '2' 
                WHEN JDP0 = 3 OR JDP0 = 4 THEN '3' 
                WHEN JOR0 = 1 THEN '1'
                WHEN JACTB0 != '' THEN '1'
      ELSE 0 
END)) / 3) as the_other_value

Answer 1

  

不允许在WHERE子句[或SELECT子句]中引用列别名，因为在执行子句时可能尚未确定列值。

所以不，你不能。