show databases;
SELECT * from student
where length(givenName) and length(familyName)=
(max(length(givenName) and length(familyName)));
show databases;
SELECT * from student
order by sum(length(givenName) and length(familyName)) desc
limit 1;
现在有一个table student，里面有id, givenName, familyName, 现在想要从这个表里找出名字总长度最长的，该怎么写query啊？我写的这两个都根本不行啊。（能顺便把存在NULL值的情况去掉吗？）