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POMysql query data transformation
 

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    <p>I am trying to do transformation on a table in Mysql. I can't figure out how to do it. Could anyone tell me how to do it? The input and output is given. I would like to know how it is done?</p> <p>Input table</p> <pre><code>+-------------+------------+------------------+-------------------+ | Employee_ID | Start_Date | Termination_Date | Performance_Level | +-------------+------------+------------------+-------------------+ | 1 | 1/1/2007 | 3/1/2007 | Low | | 2 | 6/5/2004 | Null | Medium | | 3 | 4/3/2003 | Null | High | | 4 | 9/1/2002 | 4/15/2007 | Medium | | 5 | 4/6/2007 | 11/1/2007 | Low | | 6 | 7/1/2007 | Null | High | | 7 | 3/2/2005 | 8/1/2007 | Low | +-------------+------------+------------------+-------------------+ </code></pre> <p>Ouput Table</p> <pre><code>+---------+-----------------------------------+-----------------+-------------------+----------------+ | Period | Total_Employees_at_end_of_quarter | High_Performers | Medium_Performers | Low_Performers | +---------+-----------------------------------+-----------------+-------------------+----------------+ | Q1-2007 | 4 | 1 | 2 | 1 | | Q2-2007 | 4 | 1 | 1 | 2 | | Q3-2007 | 4 | 2 | 1 | 1 | | Q4-2007 | 3 | 2 | 1 | 0 | +---------+-----------------------------------+-----------------+-------------------+----------------+ </code></pre> <p>This is what I tried</p> <pre><code>select * from emp where date(sdate)&lt; date'2007-04-01' and (date(tdate)&gt; date'2007-03-31' or tdate is null); select * from emp where date(sdate)&lt; date'2007-07-01' and (date(tdate)&gt; date'2007-06-30' or tdate is null); select * from emp where date(sdate)&lt; date'2007-010-01' and (date(tdate)&gt; date'2007-09-30' or tdate is null); select * from emp where date(sdate)&lt; date'2008-01-01' and (date(tdate)&gt; date'2007-12-31' or tdate is null); </code></pre> <p>I have the individual queries but I want a single query which will give the outputs.</p>
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