Store procedure - Syntax - Why not running properly-- ???

I have the following the code from a book but I'm getting the following error. Not Sure why. I run this into SQL Server Management Studio and create a new store procedure... What I'm missing>sqlManagement

CREATE PROCEDURE customer_sales
        (in_customer_id INT)
    DECLARE total_sales NUMERIC(8,2);

    SELECT SUM(NumberOfEmployees)
      INTO total_sales
      FROM dbo.Customer
     WHERE CustomerNumber=in_customer_id;

    SELECT CONCAT('Total sales for ',in_customer_id,' is ',total_sales);

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Msg 156, Level 15, State 1, Line 1
Incorrect syntax near the keyword 'IF'.
Msg 102, Level 15, State 1, Line 4
Incorrect syntax near 'in_customer_id'.
Msg 155, Level 15, State 2, Line 7
'NUMERIC' is not a recognized CURSOR option.
Msg 195, Level 15, State 10, Line 14
'CONCAT' is not a recognized built-in function name.
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SharathData EngineerCommented:
This is not SQL Server sproc. try this if you want to run this in SQL Server.
IF EXISTS (SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID('customer_sales'))
    DROP PROCEDURE customer_sales

CREATE PROCEDURE customer_sales 
@in_customer_id INT
    DECLARE @total_sales NUMERIC(8,2);

    SELECT @total_sales = SUM(NumberOfEmployees)
      FROM dbo.Customer
     WHERE CustomerNumber=in_customer_id;

    SELECT 'Total sales for ' + CONVERT(VARCHAR,@in_customer_id) + ' is ' + CONVERT(VARCHAR,@total_sales);

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HuaMin ChenProblem resolverCommented:
Try to use Decimal(12,2) instead of numeric, and ensure that you have created the relevant tables being used by the SP.

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MySQL Server

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