如何将选择结果用于相同的选择

Question

有一种将选择结果用于同一选择的方法？

这样的事情？

选择10作为数字，（数字/ 2）为一半FROM表格

Ty。

编辑//////////

好球员，这是实打实的。

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作为主数字的公式。因此，我认为，它可能是其他的方式来做到这一点没有这样做：

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

这是不允许的指WHERE子句[或SELECT子句在列别名，因为列值可能尚未确定该条款何时执行。

所以不，你不能。