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Anonymous
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8 years ago
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Compare values for two dates

Hello!   I have a single table with salesnumbers per customer per date:   ID|Date |Sales 1 |1.May|$100 2 |1.May|$120 3 |1.May|$0 1 |2.May|$110 2 |2.May|$90 3 |2.May|$20 1 |3.May|$80 . .. ... ...