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How to Check Change in the Status


How to Check Change in the Status

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amar_kaur16
amar_kaur16
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I have a table for instructors which contains subjects, date and time and Status information about their classes.

Once they register on the website they get the pending status, and somebody from administration either Approve, deny or Cancel their class.
so the status changes from Pending to either Approv, deny Or cancel.
I want to write a query that to piush the information to instructors if their Status gets changed from Pending to Approve, Deny Or Cancel

How do I do that.

Thaks,
Blyzzard
Elliott Whitlow
Elliott Whitlow
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Without having some way of knowing the previous status there is no query that can accomplish this.

If you add a trigger or modify the update logic to write either a flag or an audit record you could accomplish it.

But what you have described would typically be stored in a single field of a single row. So we only know the current state. How or if it changed cannot be determined..

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dwain.c
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Eliot's answer is basically correct but you could use the OUTPUT statement instead of a trigger.

Something like:


CREATE TABLE #StatusChanges (Status1 VARCHAR(20), Status2 VARCHAR(20));

UPDATE YourTable
SET Status = 'Approved'
OUTPUT DELETED.Status, INSERTED.Status
INTO #StatusChanges
WHERE ;-- whatever your WHERE criteria should be to avoid updates to all rows

SELECT *
FROM #StatusChanges
WHERE Status1 = 'Active' AND Status2='Approved'; -- Or whatever status changes you're looking for





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amar_kaur16
amar_kaur16
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Will it be possible to capture instructor's email in the new temp table along with deleted status and inserted status so we know which instructor has got the new status?

Thanks,
Blyzzard
Steve Jones
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I hate doing this in individual emails, since I think it's a poor design practice. Over time, or when things are busy, people get tons of emails that aren't necessary. This isn't really real-time information.

I'd use OUTPUT or a trigger and insert the values into a logging table. Then I'd send emails every 10, 20, 30 minutes, reading the logging table, looking for changes and emailing people with the changes.

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