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  1. PO
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    <p>I think a way to approach this is to use analytic functions...</p> <p>I set up your test case using:</p> <pre><code>create table employee_job ( emp_id integer, job_id integer, status varchar2(1 char), eff_date date ); insert into employee_job values (1,10,'A',to_date('10-JAN-2008','DD-MON-YYYY')); insert into employee_job values (2,11,'A',to_date('13-JAN-2008','DD-MON-YYYY')); insert into employee_job values (1,12,'A',to_date('20-JAN-2008','DD-MON-YYYY')); insert into employee_job values (2,11,'T',to_date('01-FEB-2008','DD-MON-YYYY')); insert into employee_job values (1,10,'T',to_date('02-FEB-2008','DD-MON-YYYY')); insert into employee_job values (2,11,'A',to_date('20-FEB-2008','DD-MON-YYYY')); commit; </code></pre> <p>I've used the <strong>lead</strong> function to get the next date and then wrapped it all as a sub-query just to get the "A" records and add the end date if there is one.</p> <pre><code>select emp_id, job_id, eff_date start_date, decode(next_status,'T',next_eff_date,null) end_date from ( select emp_id, job_id, eff_date, status, lead(eff_date,1,null) over (partition by emp_id, job_id order by eff_date, status) next_eff_date, lead(status,1,null) over (partition by emp_id, job_id order by eff_date, status) next_status from employee_job ) where status = 'A' order by start_date, emp_id, job_id </code></pre> <p>I'm sure there's some use cases I've missed but you get the idea. Analytic functions are your friend :)</p> <pre><code>EMP_ID JOB_ID START_DATE END_DATE 1 10 10-JAN-2008 02-FEB-2008 2 11 13-JAN-2008 01-FEB-2008 2 11 20-FEB-2008 1 12 20-JAN-2008 </code></pre>
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    1. COVery cool. I'd never heard of analytic functions but I'll definitely check them out. This looks much more simple that what I had tried.
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    2. COIt turns out that this will work just fine. There was a complication that it's possible to have multiple activations for a single termination, but by changing the decode line to: decode(next_status, 'A', next_eff_date - 1, next_eff_date) the problem was dealt with beautifully. Thanks a bunch.
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