如何将SELECT语句中的数值变量转换为字符变量(MySQL)

How to convert a numeric variable to a character variable in SELECT statement (MySQL)

SELECT *
   variable1,
   variable2,
   variable3,
   variable4
FROM table

我想将 variable1 从数字变量转换为字符变量,我正在尝试以下选项:

SELECT *
   variable1 AS CHAR(variable1),
   variable2,
   variable3,
   variable4
FROM table

我正在尝试其他代码:

SELECT *
   variable1 AS CONVERT(variable1, CHAR),
   variable2,
   variable3,
   variable4
FROM table

但这似乎不是正确的语法。

有什么想法吗?

SELECT 
   CONVERT(variable1,CHAR) AS variable1,
   variable2,
   variable3,
   variable4
FROM table