EXPLAIN SELECT *FROM hb_send_list
WHERE hongbao_id LIKE ‘%AA1317B32755BDFC1B8036’
EXPLAIN SELECT *FROM hb_send_list
WHERE hongbao_id LIKE ‘AA1317B32755BDFC1B8036%’
EXPLAIN SELECT *FROM hb_send_list
WHERE hongbao_id LIKE ‘A%A1317B32755BDFC1B8036’
mysql在使用like查询,%在最前面不会用到索引,中间或最后是会用到索引的,只是越靠前扫描的行数越多
原文链接:https://blog.csdn.net/lihuang319/article/details/79985394