Update master from detail

• Jim

  SSCarpal Tunnel

  Points: 4514

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  March 8, 2013 at 11:13 am

  #271360

  I have a timesheet master table and a related timesheet detail table. Each detail row could trigger need for an override approval of the whole timesheet. Currently, I have an ASP.Net application that checks for 1 or more detail rows needing override approval, and updates the master column "RequiresOV" (int). I'm thinking of setting a trigger on the detail table to do the update on the master automatically anytime a row requiring override permission is added, updated, or deleted. It would simply add up all the detail rows requiring Override, and update the master appropriately.

  Alternatively, I could make the column in the master a computed column that does roughly the same thing.

  Override rows are uncommon, say 5% of timesheets contain an override row. The average timesheet has maybe 300 rows, and there are maybe a dozen timesheets submitted per week. Some are submitted in bulk (uploaded from a workbook...) and some are hand-entered in an ASP.Net app, one row at a time.

  What do you guys think?

  Jim

• Sergiy

  SSC Guru

  Points: 110209

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  March 10, 2013 at 9:54 pm

  #1595366

  I would not update the master table but set up another "queue" table for approval requests.

  Once a "details" row is updates the coresponding key value is inserted by the trigger into the "queue" table, unless it's not already there:

  INSERT INTO Queue (MasterKey)

  SELECT MasterKey FROM Details D

  WHERE NOT EXISTS(select * from Queue Q where Q.MasterKey = D.MasterKey)

  Once Approval process is completed for any particular MaskterKey it's just removed from the Queue table.

  You may wish to add a "time stamp" column to the queue table with default GETDATE().

  Then it will be easy to process requests in order they've been submitted.

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