SQL SERVER中强制类型转换cast和convert的区别详解
SQL SERVER中强制类型转换cast和convert的区别
在SQL SERVER中,cast和convert函数都可用于类型转换,其功能是相同的,
只是语法不同.
cast一般更容易使用,convert的优点是可以格式化日期和数值.
select CAST(‘123’ as int) — 123
select CONVERT(int, ‘123’) — 123
select CAST(123.4 as int) — 123
select CONVERT(int, 123.4) — 123
select CAST(‘123.4’ as int)
select CONVERT(int, ‘123.4’)
— Conversion failed when converting the varchar value ‘123.4’ to data type int.
select CAST(‘123.4’ as decimal) — 123
select CONVERT(decimal, ‘123.4’) — 123
select CAST(‘123.4’ as decimal(9,2)) — 123.40
select CONVERT(decimal(9,2), ‘123.4’) — 123.40
declare @Num money
set @Num = 1234.56
select CONVERT(varchar(20), @Num, 0) — 1234.56
select CONVERT(varchar(20), @Num, 1) — 1,234.56
select CONVERT(varchar(20), @Num, 2) — 1234.5600
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