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                # 數據庫優化 ## 索引 想索引生效,會有一些限制,這就和前導列有關。所謂前導列,就是在創建復合索引語句的第一列或者連續的多列。比如通過:CREATE INDEX comp\_ind ON table1(x, y, z)創建索引,那么x,xy,xyz都是前導列。 前導列必須使用等于或者in操作,最右邊的列可以使用不等式,這樣索引才可以完全生效。 自動分析是否命中 預執行 # 快慢表
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