Avoid Naming User Stored Procedures SP% or SP_%

The reserved prefix that exhibits this behaviour is sp_. Not sp.

A stored procedure called spAddUser will be resolved in the normal way without looking for a matching object in master.

The relevant quote in books online is

Avoid the use of the sp_ prefix when naming procedures. This prefix is
used by SQL Server to designate system procedures. Using the prefix
can cause application code to break if there is a system procedure
with the same name.

But I would avoid these prefixes anyway. If all the stored procedures are prefixed sp it quickly gets annoying IMO.

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