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What is the preferred way to convert string to a number in SQL Server?
The following code generates an error in SQL Server 2005.
DECLARE @myString varchar(255) = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
SELECT CAST(@myString AS INT)
The code above gives the following error:
Msg 242, Level 16, State 3, Line 4
The conversion of a varchar data type to a datetime data type resulted in an out-of-range value.
The statement has been terminated.
Using this code the error does not occur:
DECLARE @myString varchar(255) = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
SELECT CAST(@myString AS int)
Can anyone explain why the cast must be made to an int? And is there a recommended approach?
A:
SQL Server is giving you an error because it doesn't know how to perform the conversion. You need to cast it as a numeric (data type):
DECLARE @myString varchar(255) = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
SELECT CAST(@myString AS INT)
A:
When you cast a string to an int the string is implicitly treated as varchar2. It's implicit because the only way you could convert a string into an int in a valid way would be to cast it as a varchar (though ints can be varchar).
Your error message is telling you that it can't convert a varchar to a datetime. Your varchar is too long for a datetime - you can't convert a varchar2 to a datetime. You need to explicitly use a numeric be359ba680
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