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    Calculating 1/2 hour averages

    Looking for some ideas on how to average my data by 1/2 increments. We've got a weather station and the data is written to a sql database every 2 minutes. I need to someone average the data by 1/2 hour increments. So, data between 3pm and 3:30pm need to be averaged for the 3:30pm time...
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