node operates mysql, why do some query strings usebackticks ``, and some usedouble quotes ""? Is there any meaning? I hope to answer your questions

//查询 var selectSQL='select * from `mytable`'; //添加 var insertSQL='insert into `mytable` (`name`)values("mary")'; //修改 var updateSQL='update `mytable` set `name`="caton" where name="mary"' //删除 var deleteSQL='delete from `mytable` where `name` like "caton"'; //执行SQL connection.query(updateSQL, function(err, rows) { if (err) throw err; });