Re: left join with sum and group by
Posted by:
Rick James
Date: August 20, 2010 11:40PM
Give this a try... First find all the employees (SELECT DISTINCT ...). Then use a cross join to get all dates and all employees. Finally do the LEFT JOIN as you tried.
SELECT a.date, a.weekday, a.workinghours,
e.employee,
sum(b.hours),
sum(b.hours) - a.workinghours
FROM a
JOIN ( SELECT DISTINCT employee FROM b ) AS e
LEFT JOIN b ON a.date = b.date
GROUP BY a.date, e.employee
(Note the missing ON clause in the JOIN)
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August 18, 2010 05:46AM
Re: left join with sum and group by
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August 20, 2010 11:40PM
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