If you need to check if a login exists in SQL Server , you can use query the master. dbo. syslogins for it.
There are some dmvs where you can get an idea about if it is in use: SELECT * FROM sys. syslogins contains the datetime when the account was last updated. There is also a column which tells you when the login was last accessed. Bu the last accessed column is "Identified for informational purposes only.
Go to security option. Expand and right click on Logins. click reports> Standard reports > Login statistics.
Here's a way to do this in SQL Server 2005 and later without using the deprecated syslogins view:
IF NOT EXISTS
(SELECT name
FROM master.sys.server_principals
WHERE name = 'LoginName')
BEGIN
CREATE LOGIN [LoginName] WITH PASSWORD = N'password'
END
The server_principals view is used instead of sql_logins because the latter doesn't list Windows logins.
If you need to check for the existence of a user in a particular database before creating them, then you can do this:
USE your_db_name
IF NOT EXISTS
(SELECT name
FROM sys.database_principals
WHERE name = 'Bob')
BEGIN
CREATE USER [Bob] FOR LOGIN [Bob]
END
From here
If not Exists (select loginname from master.dbo.syslogins
where name = @loginName and dbname = 'PUBS')
Begin
Select @SqlStatement = 'CREATE LOGIN ' + QUOTENAME(@loginName) + '
FROM WINDOWS WITH DEFAULT_DATABASE=[PUBS], DEFAULT_LANGUAGE=[us_english]')
EXEC sp_executesql @SqlStatement
End
As a minor addition to this thread, in general you want to avoid using the views that begin with sys.sys* as Microsoft is only including them for backwards compatibility. For your code, you should probably use sys.server_principals. This is assuming you are using SQL 2005 or greater.
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
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