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.
rush:sql;">
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),1) -- 1,234.56
select CONVERT(varchar(20),2) -- 1234.5600
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