数据库查询复杂的select语句

Question

我的桌子有id名称和经理ID

id  name  manager_id
1  myName  4
2  alex    3
3  brain   2
4  someone 1

现在我必须编写显示结果的查询

myname someone
alex brain
brain alex
someone myname

表示我们必须根据Id

显示name和mnager Name

Answer 1

加入表格：

SELECT t1.name, t2.name FROM my_table AS t1 
    LEFT JOIN my_table AS t2 ON( t1.manager_id = t2.id )

Answer 2

这会让你回归吗？

SELECT
  t1.name AS Name,
  t2.name AS manager
FROM tab t1
  JOIN tab t2 ON(t1.manager_id = t2.id)

Answer 3

SELECT
  employee.name,
  manager.name
FROM
  tablename employee
INNER JOIN
  tablename manager
ON
  employee.manager_id = manager.id

将tablename替换为实际的表名。