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