SQL task for adding data not in table

Hi all.

I have a SQL 2000 DTS that I would like to insert data present in one table not in a second table.

The first table (myTableA) has one field: ItemCategory

The second table (myTableB) has 2 fields: CustomerID and ItemCategory

I want to be able to add values from the first table (myTableA) that are not present in myTableB.

For example:

myTableA: AAA, ABC, DEF
myTableB: CustomerID: 123, ItemCategory: AAA
CustomerID: 123, ItemCategory: ABC

So the task would run and find that CustomerID: 123 was missing ItemCategory DEF

Any idea how I can do this?

Thank you in advance!
printmediaAsked:
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Guy Hengel [angelIII / a3]Connect With a Mentor Billing EngineerCommented:
we can use the same logic, nevertheless:
select c.customerid, a.itemcategory
from mytableA a
cross join (select customerid from mytableB group by customerid ) c
where not exists( select null from myTableB b where b.customerid = c.customerid and b.itemcategory = a.itemcategory )

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Guy Hengel [angelIII / a3]Billing EngineerCommented:
for a single customer:
select * from mytableA a
where not exists( select null from myTableB b where b.customerid = 123 and b.itemcategory = a.itemcategory ) 

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printmediaAuthor Commented:
How about for mutlitple customers?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
supposing you have a table with the customers:
select c.customerid, a.itemcategory
from mytableA a
cross join tblCustomer c
where not exists( select null from myTableB b where b.customerid = c.customerid and b.itemcategory = a.itemcategory )

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printmediaAuthor Commented:
Although we do have a separate customer table, the customers in myTableB are specific customers that do not include all our customers. The table that will hold the customers is myTableB.

The SQL task that runs before this one, adds new customers to myTableB so by the time this task runs, myTableB will have an updated customer list.

This task's purpose is to add new itemcategories (a new itemcategory is added to myTableA) to the existing list of customers in myTableB.

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printmediaAuthor Commented:
Great thanks!
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