sql - MYSQL create a subquery -


i'm trying write msyql query i'll find items have closed & sold not yet charged customer.

basically, have catalog_item product, , once catalog item closes, charge customer, , record in our customer_order table (there's column called catalog_item_id can join on).

so need to:

1) find active items closed bids (covered below in code),

2) join customer_order, @ orders , reject catalog_items in first part of query have order.

the first part of query written below, second part of query goes past sql knowledge , believe requires subquery. welcome in advance!!!!

select *  catalog_item  ci left outer join customer_order co on co.catalog_item_id = ci.catalog_item_id    ci.close_date < now()     , ci.active = 1   , ci.bid_count > 0

if want "get rid of catalog items have orders", want check left join doesn't find anything:

select *  catalog_item  ci left outer join      customer_order co      on co.catalog_item_id = ci.catalog_item_id ci.close_date < now() ,       ci.active = 1 ,       ci.bid_count > 0 ,       co.catalog_item_id null;

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