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POMysql query group by per hour return zero if no data found for an hour
 

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    <p>I have a three mysql database table which contains the call record of the customer company. I want to fetch the data from the database for a company group by per hour. If there is no data for an hour, it should return Zero.</p> <p>I am executing this query, but am getting the result for that hour only for which there is a data in the database.</p> <p>This is my query.</p> <pre><code>select ph_Plans.Comp_ID, Plan_Type, ph_Companies.CompanyName, (sum(call_length_billable)*100)/(Plan_Limit*60) as total, hour(calldate) from ph_Plans join ph_Companies on ph_Companies.Comp_ID = ph_Plans.Comp_ID join cdr on cdr.CompanyName = ph_Companies.CompanyName where Plan_Type='Per_Min' and date(calldate)='2012-10-01' and ph_Companies.CompanyName='"ReadySpace-EN"' group by hour(calldate); </code></pre> <p>This is the result that am getting.</p> <pre><code>+---------+-----------+-----------------+--------+----------------+ | Comp_ID | Plan_Type | CompanyName | total | hour(calldate) | +---------+-----------+-----------------+--------+----------------+ | 44 | Per_Min | "ReadySpace-EN" | 3.7467 | 1 | | 44 | Per_Min | "ReadySpace-EN" | 9.4933 | 18 | | 44 | Per_Min | "ReadySpace-EN" | 1.6600 | 20 | | 44 | Per_Min | "ReadySpace-EN" | 3.7333 | 21 | | 44 | Per_Min | "ReadySpace-EN" | 4.6067 | 2 | | 44 | Per_Min | "ReadySpace-EN" | 7.6533 | 23 | +---------+-----------+-----------------+--------+----------------+ </code></pre> <p>But I want the result from zeroth hour to 23 hour. If no data then it should return zero.</p>
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