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

You just need a left outer join instead of an inner join:

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
     sharer_emailshare se 
     ON d.date = to_char(date_trunc('day', se.created), 'YYYY-MM-DD'))  
GROUP BY d.date;