Beginning Microsoft SQL Server 2008 ... - S3 Tech Training

Appendix A: System Functions
The SUSER_ID system function has long since been replaced by SUSER_SID, and remains in the product
purely for backward compatibility purposes. Avoid using SUSER_ID, as the internal value it returns
may change from server to server (the SID is much more reliable when you consider a database may be
restored to a new server where a given login may have a different SUSER_ID).
SUSER_NAME
The SUSER_NAME function returns the specified user’s login ID name. The syntax is as follows:
SUSER_NAME([])
The server_user_id parameter is the specified user’s login ID number. If no value for
server_user_id is provided, the default of the current user will be used instead.
The SUSER_NAME system function is included in SQL Server 2000 for backward compatibility only, so
if possible you should use SUSER_SNAME instead.
SUSER_SID
The SUSER_SID function returns the security identification number (SID) for the specified user. The syntax
is as follows:
SUSER_SID([‘’])
The login parameter is the user’s login name. If no value for login is provided, the current user will be
used instead.
SUSER_SNAME
The SUSER_SNAME function returns the login ID name for the specified security identification number
(SID). The syntax is as follows:
SUSER_SNAME([])
The server_user_sid parameter is the user’s SID. If no value for the server_user_sid is provided,
the current user’s will be used instead.
USER
The USER function allows a system-supplied value for the current user’s database username to be
inserted into a table if no default has been supplied. The syntax is as follows:
USER
USER_ID
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The USER_ID function returns the specified user’s database ID number. The syntax is as follows:
USER_ID([‘’])