mysql - mysql：选择*，其中名字和姓氏以相同的字母开头

Question

SELECT * FROM `people` WHERE first_name like 'm%' and last_name like 'm%';

- 这会选择具有相同名字和姓氏的人，但仅此m而已。如何从 a 到 z 选择所有这样的人（按 desc 排序不是问题）？

Answer 1

SELECT * FROM `people` WHERE UPPER(LEFT(first_name, 1)) = UPPER(LEFT(last_name, 1))

说明：取名字和姓氏最左边的 1 个字符，将它们转换为大写，并进行比较。

Answer 2

SELECT * FROM people WHERE LEFT(first_name, 1) = LEFT(last_name, 1);
ORDER BY last_name, first_name

Answer 3

select *
 from people
 where substring(first_name,1,1) = substring(last_name,1,1)
 order by last_name, first_name