groupby12345是什麽意思

group by 英[ɡru:p bai] 美[ɡrup ba?]

[詞典] [計][WIN] 分組依據;

[例句]It can improve performance if columns involved in ORDER BY and GROUP BY are indexed.

如果為ORDER BY和GROUP BY所涉及的列建立了索引，那麽可以提高性能。

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