Forced type conversions in SQL Server cast and convert

Source: Internet
Author: User

In SQL Server, both the cast and CONVERT functions are available for type conversions, and their functions are the same.

It's just a different syntax.

Cast is generally easier to use, and the advantage of convert is that dates and values can be formatted.

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 //Use Real to match. 55 Such data Select CONVERT (Real, '. ")--0.55

DECLARE @Num Money
Set @Num = 1234.56
Select CONVERT (varchar (0), @Num,)--1234.56
Select CONVERT (varchar), @Num, 1)--1,234.56
Select CONVERT (varchar (2), @Num,)--1234.5600

Forced type conversions in SQL Server cast and convert

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