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Query database by date and send results to table Expand / Collapse
Posted Tuesday, April 22, 2014 6:03 AM


Group: General Forum Members
Last Login: Monday, April 28, 2014 6:46 AM
Points: 19, Visits: 37
I'm a bit of a SQL newb but have been tasked with coming up with some code to retrieve values from a historian database. I'm retrieving the name of an object (tag) and its value at a specific time every month of the year. However, the year will be user defined parameter coming from a report. So if the user selects 2014 it should query on 1/1/2014,2/1/2014 and so on.

I came up with the simple part of the query which is looking up the tag names and associated values:

SELECT Tagname,value
From runtime.dbo.History
WHERE Tagname IN ('Tag1', 'Tag2')
and wwVersion = 'Latest'
and DateTime = @Date

Here are the issues I need to solve:
1. I can manually set the @Date but I'd like to have it do whats described above. I'm thinking some type of loop might be used?
2. I'm not sure how to output it into table format to look like:

Tag 1, (jan value), (feb value), (mar value), etc...
Tag 2, (jan value), (feb value), (mar value), etc...

Any help would be appreciated. Thanks!
Post #1563797
Posted Tuesday, April 22, 2014 8:32 AM



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Last Login: Today @ 2:32 PM
Points: 13,302, Visits: 12,168
You definitely don't need a loop for this. You can do this using a tally or a calendar table (not totally sure which one fits best). In order to help we will need a few things:

1. Sample DDL in the form of CREATE TABLE statements
2. Sample data in the form of INSERT INTO statements
3. Expected results based on the sample data

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Post #1563880
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