如何检查相同表的行列表

Question

我有一张这样的桌子：

我的查询是列出在20150131到20150228之间离职的员工

Answer 1

您可以使用：

SELECT * FROM employees
WHERE Month_ending BETWEEN 20150131 AND 20150228;

下次，先来看看：

Answer 2

SELECT T1.Emp_id FROM yourTable T1
   WHERE NOT EXISTS (SELECT 1 
                    FROM yourTable T2
                   WHERE T2.Emp_id = T1.Emp_id
                     AND T2.Month_ending <> T1.Month_ending)

答案主要基于https://stackoverflow.com/a/12472316/1544886

Answer 3

使用查询

SELECT Emp_id 
FROM Employee_details 
WHERE [Month_ending] = '20150131'
AND [Emp_id] NOT IN(
  SELECT [Emp_id]
  FROM Employee_details
  WHERE [Month_ending] = '20150228'
)