在一个查询中，获取姓氏长度，名字长度和按长度分组的三列

Question

我是菜鸟...正在处理家庭作业问题。

具有一个具有last_name，first_name的成员表。我想编写一个查询，该查询按字符串长度汇总last_name，first_name的长度。

输出将包含三列-name_length，count_of_last_names，count_of_first_names。

两个单独的查询：

`SELECT LENGTH(last_name) AS "LnameLen", COUNT(LENGTH(last_name)) AS "CntLnameLen"
FROM members
GROUP BY LENGTH(last_name)
ORDER BY "LnameLen" DESC;

SELECT LENGTH(first_name) AS "FnameLen", COUNT(LENGTH(first_name)) AS "CntFnameLen"
FROM members
GROUP BY LENGTH(first_name)
ORDER BY "FnameLen";`

但是我想编写一个一个查询，该查询输出上述两个查询的工作，因此输出将是三列：Length_of_Name，CntLnameLen，CntFnameLen。

建议？谢谢！

Answer 1

按照我对问题的理解方式，类似这样的东西可能就是您要寻找的东西。

select length(first_name), 
       length(last_name),
       count(*)
from members
group by length(first_name), 
         length(last_name);