如何计算SQL中计算列的出现次数？

Question

In ms sql, I try to count occurence of a computed column . 在ms sql中，我尝试计算计算列的出现次数。

With a normal classic, no worries: 拥有正常的经典，不用担心：

  SELECT ID, COUNT(*)
    FROM User
    GROUP BY ID

But with calculated column it display an Error 但是使用计算列，它会显示错误

SELECT CONVERT(INT, (ID * PI()))  AS TOTO,  COUNT(*) 
FROM User
GROUP BY TOTO

Do you know if there is a way to do it? 你知道有没有办法做到这一点？

Answer 1

Use this...you want to group by the same computed expression to get the count grouped by that expression 使用此...您希望按相同的计算表达式进行分组，以获得按该表达式分组的计数

SELECT CONVERT(INT, (ID * PI()))  AS TOTO,  COUNT(*) 
FROM User
GROUP BY CONVERT(INT, (ID * PI()))