SQL, Store Procedure

Hi Experts, can some one tell me that the purpose of type='p' and why "select 1 from "

if exists (select 1 from sys.objects where name = 'sp_rept_EmployeePerformance' and type = 'P')
	drop procedure sp_rept_TitleLoan_EmployeePerformance

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Thank you,
tanj1035Asked:
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
'P' means Stored Procedure. 'F' is function, v is view, etc.  It's used in the above T-SQL just in case somebody created a non-stored procedure object named sp_rept_EmployeePerformance
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Brian CroweDatabase AdministratorCommented:
type "p" is a procedure.  The objects tables also contains, tables, views, etc. and this is just a safeguard to make sure you are getting the precise object you want.
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Brian CroweDatabase AdministratorCommented:
BTW you should never prepend your procedures with "sp_".  It will work but you are adding unnecessary overhead as the compiler assumes that it is a system procedure and will look there first.

https://www.mssqltips.com/sqlservertutorial/169/naming-conventions-for-sql-server-stored-procedures/
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tanj1035Author Commented:
Thank Jim and Brian's explanations.
Why there is a "select 1 from" and what does 1 mean ?
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Select the first column.  In the context of IF EXISTS() all that really matters is if a row is returned or not.  It could have easily said select name, name, type, or *.

The DROP PROC will execute if the proc exists, and will no execute if it doesn't.
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Brian CroweDatabase AdministratorCommented:
Another way to do the same thing if you aren't worried about another object having the same name is:

IF OBJECT_ID('sp_rept_EmployeePerformance') IS NOT NULL
   DROP PROCEDURE sp_rept_EmployeePerformance;
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Thanks for the split, good luck with your code.  -Jim
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