You have a stored procedure GetCustomers with two parameters: The stored procedure returns all the records matching the values of the parameters. You want the parameters be optional, which means skipping the parameter if you do not pass a value. T-SQL does not provide optional parameters, but you can implement one. You have original stored procedure. Add IS NULL at your WHERE clause. Now you have optional parameters in the stored procedure.
Call the stored procedure from your data access layer C code FirstName is optional. Nice article but you can make your SQL faster by using COALESCE in the where clause: No, you can not. Sorry to say, but learn the basics before making comments. Well, at least you have the guts to put that into a public comment, Paul. One thing seriously missing is the explanation of the HUGH downside unless one creates the stored procedure "with recompile" - which is that the FIRST run decides the execution plan, and that is being reused.
To avoid this, the SP must be recompiled on every execution. Especially with something like given in this example this may be significant bad performance otherwise. Nice comment amsneuton exactly what solved my issue. Hey Thomas Tomiczek, you strike me as a guy who knows a lot about SQL Server, and who also happens to be a jerk. Congrats on the first one. Work on the second. My partner and I stumbled over here from a different page and thought I might check things out.
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SQL Server optional input output parameters
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sql server - Can I have an optional OUTPUT parameter in a stored procedure? - Stack Overflow
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