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lang-sql
R.usageWhen LIKE "2012-07-08T12:%"to(R.usageWhen >= '2012-07-08T12:00:00' AND R.usageWhen < '2012-07-08T13:00:00')so index use is possible.YYY-MM-DDTHH:MM:SS, and the column is indexed as @ypercube hinted at, you should be fine.