为什么嵌套转换在 MySQL 中不起作用？ （它确实使用 SQL Server）
select cast(cast(myColumn as decimal(5,2)) as int) from myTable
SQLFiddle示例 http://sqlfiddle.com/#!2/682a6/12
根据手册 http://dev.mysql.com/doc/refman/5.0/en/cast-functions.html#function_cast:
CAST(expr AS type) [...]
CONVERT(expr,type) [...]
The type可以是以下值之一：
-
BINARY[(N)]
-
CHAR[(N)]
-
DATE
-
DATETIME
-
DECIMAL[(M[,D])]
-
SIGNED [INTEGER]
-
TIME
-
UNSIGNED [INTEGER]
因此，只需按照手册操作即可：
SELECT CAST(CAST(myColumn AS DECIMAL(5,2)) AS SIGNED) FROM myTable
or
SELECT CAST(CAST(myColumn AS DECIMAL(5,2)) AS UNSIGNED) FROM myTable
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