On Tuesday, January 1, 2019, Adrian Klaver <
adrian.klaver@aklaver.com> wrote:
On 1/1/19 11:26 AM, John W Higgins wrote: with accounts_over_total as (
select accountid from transactions where sum(amount) >= 50 group by accountid)
Unfortunately there is a hitch in the above:(
select p_item_no from projection where sum(qty) > 100 group by(p_item_no);
ERROR: aggregate functions are not allowed in WHERE
Which is where the HAVING clause comes in. It filters out groups based on an expression containing an aggregate function.
David J.