Checking if a SQL Server login already exists

Question

I need to check if a specific login already exists on the SQL Server, and if it doesn\'t, then I need to add it.

I have found the following code to actually add the

Answer 1

You can use the built-in function:

SUSER_ID ( [ 'myUsername' ] )

via

IF [value] IS NULL [statement]

like:

IF SUSER_ID (N'myUsername') IS NULL
CREATE LOGIN [myUsername] WITH PASSWORD=N'myPassword', 
DEFAULT_LANGUAGE=[us_english], 
CHECK_EXPIRATION=OFF, 
CHECK_POLICY=OFF 
GO

https://technet.microsoft.com/en-us/library/ms176042(v=sql.110).aspx