Referring to a select aggregate column alias in the having clause in Postgres

Question

I\'m migrating from MySQL to Postgres. In MySQL I can use

select sum(clicks) c from table where event_date >= \'1999-01-01\' 
group by keyword_id 
having          


        

Answer 1

You can use WITH Queries (Common Table Expressions) to achieve the results like below

WITH t
AS (
    SELECT sum(clicks) c
    FROM TABLE
    WHERE event_date >= '1999-01-01'
    GROUP BY keyword_id
    )
SELECT c
FROM t
WHERE c > 10