索引（一）索引的本質

索引（一）索引的本質 先看一個sql SELECT count(*) FROM op_log WHERE method = "updateActivity" AND operator_id ="shinan" AND create_time > 1533819466000 AND create_time < 1543819466000 AND type=1; 查詢效率很慢： 1、如何建立索引

>>阅读原文<<