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In a project management scenario, it's crucial to track the start and end dates of each project. However, sometimes the actual end date of a project might not coincide with the initially planned end date. This SQL query is designed to find the real end date for each project start date, considering the cases where the start date of one project is not the end date of another project.
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The query works by first selecting the start dates from the Projects table that are not also end dates in the same table. It does the same for end dates. Then, it joins these two sets of dates on the condition that the start date is earlier than the end date. It groups the results by start date and selects the minimum end date for each group, which represents the real end date for each project. Finally, it orders the results by the difference between the real end date and the start date, and then by the start date itself.
SELECT s.Proj_Start_Date, min(e.Proj_End_Date) as Real_Proj_End_Date
FROM
(SELECT Start_Date as Proj_Start_Date FROM Projects WHERE Start_Date NOT IN (SELECT End_Date FROM Projects)) s,
(SELECT End_Date as Proj_End_Date FROM Projects WHERE End_Date NOT IN (SELECT Start_Date FROM Projects)) e
WHERE s.Proj_Start_Date < e.Proj_End_Date
GROUP BY s.Proj_Start_Date
ORDER BY DATEDIFF(min(e.Proj_End_Date), s.Proj_Start_Date) ASC, s.Proj_Start_Date ASC;
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