Question

I have a very large table.

Each row has a uniqueId and an itemId. I want to delete all items that are priced below a given average. I figured something like this should work, but it doesnt:

 DELETE FROM items GROUP BY itemId HAVING avg(price) < ?

SQLite complains:

near “GROUP”: syntax error

Any idea what might be going on?

Answer 1

DELETE 
FROM items as i1 
WHERE i1.itemID in (
    Select i2.itemID 
    FROM items as i2
    GROUP BY i2.itemId 
    HAVING avg(price) < "user defined threshold" )