SQL Server 2012 Create or Alter Procedure

In SQL Server 2012, you can use the CREATE OR ALTER PROCEDURE statement to create a new stored procedure or modify an existing one. This statement simplifies the process of modifying existing stored procedures by removing the need to drop and recreate them.

Syntax

The syntax of the CREATE OR ALTER PROCEDURE statement is as follows:

CREATE OR ALTER PROCEDURE procedure_name
    [ { @parameter [ data_type ] [ = default ] } ]
    [ WITH <procedure_option> [ ,...n ] ]
    AS
    sql_statement [ ; ]

Parameters

• procedure_name: The name of the stored procedure you want to create or modify.
• @parameter: Optional input parameter(s) for the stored procedure.
• data_type: The data type of the input parameter.
• default: The default value for the input parameter.
• procedure_option: One or more procedure options to set when creating or modifying the stored procedure.
• sql_statement: The SQL statements to be executed when the stored procedure is called.

Example

Here is an example of the CREATE OR ALTER PROCEDURE statement:

CREATE OR ALTER PROCEDURE get_customer_details
    @customer_id int,
    @order_count int = 0
AS
BEGIN
    SELECT customer_name, address, phone_number
    FROM customers
    WHERE customer_id = @customer_id
      AND order_count >= @order_count
    ORDER BY order_count DESC
END

In this example, we create a stored procedure called get_customer_details that takes two input parameters: @customer_id and @order_count. The @order_count parameter has a default value of 0.

When the stored procedure is called, it selects the customer_name, address, and phone_number columns from the customers table where the customer_id matches the @customer_id parameter and the order_count is greater than or equal to the @order_count parameter.

Conclusion

The CREATE OR ALTER PROCEDURE statement allows you to create or modify stored procedures in SQL Server 2012 without the need to drop and recreate them. By using input parameters, you can create flexible and reusable stored procedures that can be called from other SQL statements.