Cross Tab - Storing different dates (Meeting1, Meeting2, Meeting 3 etc) in the same column

Question

I need to keep track of different dates (dynamic). So for a specific Task you could have X number of dates to track (for example DDR1 meeting date, DDR2 meeting date, Due Da

Answer 1

Here is a proper answer, tested with your data. I only used the first two date types, but you'd build this up on the fly anyway.

Select 
    Tasks.TaskDescription,     
    Min(Case DateType.DateDescription When 'DDR1' Then Tasks_DateType.Date End) As DDR1,     
    Min(Case DateType.DateDescription When 'DDR2' Then Tasks_DateType.Date End) As DDR2
From
    Tasks_DateType
    INNER JOIN Tasks ON Tasks_DateType.TaskID = Tasks.TaskID
    INNER JOIN DateType ON Tasks_DateType.DateTypeID = DateType.DateTypeID
Group By
    Tasks.TaskDescription

EDIT

van mentioned that tasks with no dates won't show up. This is correct. Using left joins (again, mentioned by van) and restructuring the query a bit will return all tasks, even though this is not your need at the moment.

Select 
    Tasks.TaskDescription,     
    Min(Case DateType.DateDescription When 'DDR1' Then Tasks_DateType.Date End) As DDR1,     
    Min(Case DateType.DateDescription When 'DDR2' Then Tasks_DateType.Date End) As DDR2
From
    Tasks   
    LEFT OUTER JOIN Tasks_DateType ON Tasks_DateType.TaskID = Tasks.TaskID
    LEFT OUTER  JOIN DateType ON Tasks_DateType.DateTypeID = DateType.DateTypeID
Group By
    Tasks.TaskDescription