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.
代码
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
页:
[1]