mysql– 嵌套的CAST无法正常工作

概述为什么嵌套的转换不适用于MySQL？ (它确实使用SQL Server)select cast(cast(myColumn as decimal(5,2)) as int) from myTable SQLFiddle Example最佳答案根据the manual： CAST(expr AS type) [...] CONVERT(expr

为什么嵌套的转换不适用于MySQL？ (它确实使用sql Server)

select cast(cast(myColumn as decimal(5,2)) as int) from mytable 

SQLFiddle Example最佳答案根据the manual：

CAST(expr AS type) […]

CONVERT(expr,type) […]

The type can be one of the following values:

BINARY[(N)]

CHAR[(N)]

DATE

DATETIME

DECIMAL[(M[,D])]

SIGNED [INTEGER]

TIME

UNSIGNED [INTEGER]

所以,只需按照手册：

SELECT CAST(CAST(myColumn AS DECIMAL(5,2)) AS SIGNED) FROM mytable

要么

SELECT CAST(CAST(myColumn AS DECIMAL(5,2)) AS UNSIGNED) FROM mytable

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