Bob,
>> SELECT * FROM product_table p
>>LEFT JOIN sale_table s USING (prod_id)
>>WHERE s.prod_id IS NULL;
>I have not tested that but I don't think it will work. Try:
>SELECT item_name
>FROM product_table
>WHERE prod_id not in (select prod_id from sale_table);
These two queries are logically equivalent. Both work. The first will
usually be faster.
PB
Bob Gailer wrote:
Peter Brawley wrote:
Grant,
>If I want to select all the products that are in the product_table,
>but not in the sale_table, how to make the query? The product_table
>has all the products, but the sale table is a subset of the
product_table.
SELECT * FROM product_table p
LEFT JOIN sale_table s USING (prod_id)
WHERE s.prod_id IS NULL;
I have not tested that but I don't think it will work. Try:
SELECT item_name FROM product_table WHERE prod_id not in (select
prod_id from sale_table);
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