如何在 mysql 中将别名设置为 Integer

Question

我是 mysql 的新人，我还没有找到任何相关信息。这就是我想要的:

SELECT Uzmanadid, 
       Kurumid, 
       SUM(Bireysel), 
       IF(Kurumid like '%L%', IF(SUM(Bireysel) > 120, 20, 15), 
       IF(SUM(Bireysel) > 90, 20, 15)) AS my_num, 
       (SELECT my_num) * 5 AS another_number 
FROM Tbl_pss2

我该怎么做？

Answer 1

您不能在同一查询子句的同一 select 中使用别名。您需要使用子查询或 CTE 或使用相同的表达式而不是别名。（但您可以在同一查询的 having 子句中使用该别名来过滤某些结果）。

使用子查询

SELECT *,t.my_num* 5 AS another_number 
FROM
(SELECT Uzmanadid, 
       Kurumid, 
       SUM(Bireysel), 
       IF(Kurumid like '%L%', IF(SUM(Bireysel) > 120, 20, 15), 
       IF(SUM(Bireysel) > 90, 20, 15)) AS my_num
 FROM Tbl_pss2) as t;

使用 CTE

WITH C AS
(SELECT Uzmanadid, 
       Kurumid, 
       SUM(Bireysel), 
       IF(Kurumid like '%L%', IF(SUM(Bireysel) > 120, 20, 15), 
       IF(SUM(Bireysel) > 90, 20, 15)) AS my_num
       FROM Tbl_pss2
)
SELECT *,my_num* 5 AS another_number 
FROM C;

DEMO

如何在 mysql 中将别名设置为 Integer

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