troubleshooting Question

SQL for top of the hour data

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browneye9000 asked on
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Disclaimer:  I am an SQL idiot.  Everything I have done is copy and paste with the help of others.

I am currently using SQL to query a database located in one application called InfoPlus21 ( a process control data historian) to another application called Northwest Analytical (a statistical process control application).  Someone told me that I need to say what the DBMS is but I don't know.

This is the code I have so far.

SELECT ts, avg  FROM aggregate  WHERE name='T2EG:AE143201.PV'  AND ts > getdbtime-500:00:00.0  AND period = 1:00

The ts stands for time stamp.  The problem is that when I run the query the data is pulled starting with the getdbtime (I guess this is the current time) and then goes back for 500 1 hr intervals.

For reasons that are much too detailed to write here I need for the first time stamp to be started at the 00:00:00.0 time.  I gues this may be achieved by taking the getdbtime and then going back to the first occurance of 00:00:00.0 but I'm not sure how to do this.

Please feel free to ask questions if you need more clarification but keep my disclaimer in mind.

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