How to update exiting data in a table in MYSQL

[Amit Sehdev]

HI

I am new to this forumn however I have a database set up in MYSQL and everyday I insert new data into this data. But every time i insert new data into this table the old data does not update and I keep getting errors when trying to change the query.

Basically I want it to insert the new data and also update any existing values.

I have provided the query below.

Thanks

ALTER PROCEDURE [dbo].[APPEND_EPOS]
-- Add the parameters for the stored procedure here

AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

-- Insert statements for procedure here

--INSERT NEW EPOS DATA
INSERT INTO EPOS.DBO.EPOS (EPOS_PRODUCTS_ID, EPOS_SALES_VALUE, EPOS_SALES_QTY, EPOS_DATE, CUSTOMERS_ID, STORE_DISTRIBUTION, EPOS_DESCRIPTION)
Select A1.[Supply Item Nbr], A1.[EPOS Sales], A1.[EPOS Qty], A1.Daily, 542, A1.[Est EPOS Store Count] , ISNULL(A1.[Shelf Description],'') + ' ' + ISNULL(A1.Variety, '') + ' ' + ISNULL(A1.[Size Desc],'')
FROm EPOS...ASDA_EPOS_DAILY7 A1

LEFT JOIN
(SELECT DISTINCT Customers_ID, EPOS_Products_ID, CAST(EPOS_Date as Date) as EPOS_Date
from KP_EPOS.dbo.EPOS) Exis ON Exis.Customers_ID = 542 and Exis.EPOS_Products_ID = CAST(A1.[Supply Item Nbr] as Integer) and CAST(Exis.EPOS_Date as Date) = CAST(A1.Daily as Date)

WHERE
Exis.Customers_ID IS NULL
AND A1.DAILY IN (Select A2.Daily FROm ASDA_EPOS...ASDA_EPOS_DAILY7 A2 WHERE NOT A2.[EPOS Qty] =0 OR NOT A2.[EPOS Sales]=0 )
END