PostgreSQL query to count/group by day and display days with no data

Question

I need to create a PostgreSQL query that returns

• a day
• the number of objects found for that day

It\'s important that every sing

Answer 1

Based on Gordon Linoff's answer I realized another problem was that I had a WHERE clause that I didn't mention in the original question.

Instead of a naked WHERE, I made a subquery:

SELECT d.date, count(se.id) FROM (
    select to_char(date_trunc('day', (current_date - offs)), 'YYYY-MM-DD')
    AS date 
    FROM generate_series(0, 365, 1) 
    AS offs
    ) d 
LEFT OUTER JOIN (
    SELECT * FROM sharer_emailshare 
    WHERE showroom_id=5
) se
ON (d.date=to_char(date_trunc('day', se.created), 'YYYY-MM-DD')) 
GROUP BY d.date;