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 is using like query,% will not use index in the front, index will be used in the middle or last, but the number of rows scanned in the front is more
Original link: https://blog.csdn.net/lihuang319/article/details/79985394