mysql匹配查詢

1.使用like，但是like在前面加%會讓索引失效

SELECT count(1) FROM t_project WHERE project_address LIKE('%煙臺市%');

2.使用LOCATE(substr,str)函數/LOCATE(substr,str,pos)

SELECT count(1) FROM t_project WHERE LOCATE('煙臺市',project_address);