This is one topic that I continually find myself refering to my notes and bookmarks on and I’ve finally decided to add this piece of very good reference information to my own blog.

Tables

Option 1:

IF OBJECT_ID('enterTableNameHere', 'U') IS NOT NULL
BEGIN
    DROP TABLE [dbo].[enterTableNameHere]
END
GO

Option 2:

IF EXISTS
(
    SELECT * FROM dbo.sysobjects
    WHERE id = object_id(N'[dbo].[enterTableNameHere]')
         AND OBJECTPROPERTY(id, N'IsUserTable') = 1
)
BEGIN
    DROP TABLE [dbo].[enterTableNameHere]
END
GO

Views

IF EXISTS
(
    SELECT * FROM INFORMATION_SCHEMA.VIEWS
    WHERE TABLE_SCHEMA = 'enterSchemaNameHere' AND TABLE_NAME = 'enterViewNameHere'
)
BEGIN
    DROP VIEW [dbo].[enterViewNameHere]
END
GO

Stored Procedures

IF EXISTS
(
    SELECT * FROM dbo.sysobjects
    WHERE id = object_id(N'[dbo].[enterStoredProcedureNameHere]')
        AND OBJECTPROPERTY(id, N'IsProcedure') = 1
)
BEGIN
    DROP PROCEDURE [dbo].[enterStoredProcedureNameHere]
END
GO

User-Defined Functions

IF EXISTS
(
    SELECT * FROM INFORMATION_SCHEMA.ROUTINES
    WHERE	ROUTINE_NAME = 'enterFunctionNameHere'
    AND ROUTINE_SCHEMA = 'dbo'
    AND ROUTINE_TYPE = 'FUNCTION'
)
BEGIN
    DROP FUNCTION [dbo].[enterFunctionNameHere]
END
GO