reduce redundant salary runs #2
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the change reduces redundant employees table scans from 4 to just 1. It uses analytical function to calculate average and then uses this value in a single table scan (instead of a separate 4 runs)
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the change reduces redundant employees table scans from 4 to just 1. It uses analytical function to calculate average and then uses this value in a single table scan (instead of a separate 4 runs)