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mysql数据库 时间：2024-12-03 12:14:38
作者：文/会员上传
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use in in mysql,if the field is indexed,the index is still useful,but when the data quantity is small relative to the param in "in" parentheses,mysql optimizer
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use in in mysql,if the field is indexed,the index is still useful,but when the data quantity is small relative to the param in "in" parentheses,mysql optimizer will use ALL TABLE SCAN instead.
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