SQL SERVER中強(qiáng)制類型轉(zhuǎn)換cast和convert的區(qū)別
在SQL SERVER中,cast和convert函數(shù)都可用于類型轉(zhuǎn)換,其功能是相同的,
只是語(yǔ)法不同.
cast一般更容易使用,convert的優(yōu)點(diǎn)是可以格式化日期和數(shù)值.
select CAST('123' as int) -- 123select CONVERT(int, '123') -- 123select CAST(123.4 as int) -- 123select 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) -- 123select CONVERT(decimal, '123.4') -- 123 select CAST('123.4' as decimal(9,2)) -- 123.40select CONVERT(decimal(9,2), '123.4') -- 123.40declare @Num moneyset @Num = 1234.56select CONVERT(varchar(20), @Num, 0) -- 1234.56select CONVERT(varchar(20), @Num, 1) -- 1,234.56select CONVERT(varchar(20), @Num, 2) -- 1234.5600感謝閱讀，希望能幫助到大家，謝謝大家對(duì)本站的支持！
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