where条件中有三个字段的条件,每个字段都有mysql普通索引,但是expalin结果显示时间字段索引没有生效,调换条件顺序依旧无效,麻烦大神们解答一下。
EXPLAIN SELECT * FROM sys_data_5min_zl WHERE data_user = '2ec29aff-75f3-4a1a-972f-f27fd6099515' AND sb_date BETWEEN '2020-01-03' AND '2020-01-04' AND data_sb ='4eefa3ca-215b-43f6-aaa2-ae16abe764e2'
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把data_user、data_sb、sb_date组成联合索引试试
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