MYSQL 让两个字段拼接查询

https://blog.csdn.net/wqzbxh/article/details/84649485
SELECT concat(host,uri),ua FROM httpdataco WHERE uri LIKE ‘%BaiduApp_signed%‘;
要点是concat这个函数实现拼接

实现特殊字符串进行连接用concat_ws：

select CONCAT_WS("我是分隔符",username,passwd) as result FROM userdata ;