partition by doesn't actually roll up the data. It allows you to reset something on a per group basis. For example, you can get an ordinal ... ... <看更多>
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partition by doesn't actually roll up the data. It allows you to reset something on a per group basis. For example, you can get an ordinal ... ... <看更多>
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If you're really interested in learning about Window functions, Itzik Ben-Gan has a couple great books (High Performance T-SQL Using Window ... ... <看更多>