如题,mysql 5.6
在进行 explain sql 查看执行计划时显示是走索引的,但是在实际 sql 执行时没走索引导致查询很慢,sql 内容大概如下:
explain SELECT a,b,c,... FROM table_name WHERE a = 1 AND b in (1, 2, 4) AND c = 3 ORDER BY d DESC LIMIT 0, 200;