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SQL Query/logic help

SQL Query/logic help

SQL Query/logic help

(OP)
Hello all,

I am a graphic designer and part-time Java programmer, but I am stumped on some SQL stuff.

Basically, I have a Postgre database with some tables.  I currently have a query which generates a report from one product category in my Java front end:

"SELECT " +
                "CLOSEDCASH.HOST, " +
                "CLOSEDCASH.MONEY, " +
                "CLOSEDCASH.DATEEND, " +
                "PRODUCTS.REFERENCE, " +
                "PRODUCTS.NAME, " +
                "SUM(TICKETLINES.UNITS) AS UNITS, " +
                "SUM(TICKETLINES.UNITS * TICKETLINES.PRICE) AS TOTAL " +
                "FROM CATEGORIES, CLOSEDCASH, RECEIPTS, TICKETS, TICKETLINES LEFT OUTER JOIN PRODUCTS ON TICKETLINES.PRODUCT = PRODUCTS.ID " +
                "WHERE CLOSEDCASH.MONEY = RECEIPTS.MONEY AND RECEIPTS.ID = TICKETS.ID AND TICKETS.ID = TICKETLINES.TICKET AND PRODUCTS.CATEGORY = '09b21e95-9cd7-45ac-8f9d-577729991b41' +
                "GROUP BY CLOSEDCASH.HOST, CLOSEDCASH.MONEY, CLOSEDCASH.DATEEND, PRODUCTS.REFERENCE, PRODUCTS.NAME, CATEGORIES.PARENTID " +
                "ORDER BY PRODUCTS.NAME, CLOSEDCASH.HOST, CLOSEDCASH.DATEEND"

I need to make a simple change. The problem at the moment is that the report doesn't include sub-categories of the main category (products.category).  There is another table called "Categories" and inside this table there is the "parentid".  So, I need to basically say that if the parentid is the same as the main category selected, then show me products from that category too.

I have spent hours trying to figure this out, but I just can't get it to happen.  Can anyone help?

Thanks a million,
Christian

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