如何返回交叉年数和月数给出两个记录sql

Question

我有一个名为Employee的表。并且有三列名为start_date和end_date以及employee_name。

我正在编写存储过程，它接受两个员工（员工姓名）的start_date，end_date，如果他们一起工作，则返回true，并返回他们一起工作的年数和月数。

所以我想查询返回john和kashif一起工作的年数，如果他们一起工作，bool值为true或false。

我该怎么做？

请那里的任何人都可以帮助我，所以请做。

由于

Answer 1

DECLARE @emp1 VARCHAR(10) = 'John'
DECLARE @emp2 VARCHAR(10) = 'Kashif'


SELECT CASE WHEN EXISTS (SELECT 1 FROM Emp
                         WHERE empID = @emp2
                          AND StartDate >= t.StartDate
                          AND EndDate   <= t.EndDate)
             THEN 1 ELSE 0 END  [Has Worked together]
      ,CASE WHEN EXISTS (SELECT 1 FROM Emp
                         WHERE empID = @emp2
                          AND StartDate >= t.StartDate
                          AND EndDate   <= t.EndDate)
             THEN DATEDIFF(DAY, CASE WHEN StartDate <= t.StartDate THEN StartDate ELSE t.StartDate END 
                             ,  CASE WHEN EndDate   >= t.EndDate   THEN EndDate   ELSE t.EndDate   END) 
                      ELSE 0 END  [Days worked together]
FROM Emp t
WHERE empID = @emp1

结果

Has Worked together      Days worked together
       1                            30

存储过程

CREATE PROCEDURE dbo.myProc 
@Employee1       VARCHAR(20),
@Employee2       VARCHAR(20),
@Worked_Together BIT OUTPUT,
@Days_Worked     INT OUTPUT
AS
BEGIN
  SET NOCOUNT ON; 

SELECT @Worked_Together 
        = CASE WHEN EXISTS (SELECT 1 FROM Emp
                            WHERE empID = @Employee2
                              AND StartDate >= t.StartDate
                              AND EndDate   <= t.EndDate)
                            THEN 1 ELSE 0 END  
      ,@Days_Worked  
         = CASE WHEN EXISTS (SELECT 1 FROM Emp
                              WHERE empID = @Employee2
                                AND StartDate >= t.StartDate
                                AND EndDate   <= t.EndDate)
             THEN DATEDIFF(DAY, CASE WHEN StartDate <= t.StartDate THEN StartDate ELSE t.StartDate END 
                             ,  CASE WHEN EndDate   >= t.EndDate   THEN EndDate   ELSE t.EndDate   END) 
                      ELSE 0 END  
FROM Emp t
WHERE empID = @Employee1        

END

Answer 2

检查此查询：

DECLARE @Start_Date DATE ='2012/08/01'
DECLARE @End_Date DATE ='2014/08/01'

SELECT T1.ProfileName,
       T1.ProfileName,
       DATEDIFF(YEAR,CASE WHEN T1.START_DATE > T2.START_DATE THEN T1.START_DATE  ELSE T2.START_DATE                     End,CASE WHEN T1.End_DATE > T2.End_DATE THEN T2.End_DATE  ELSE T1.End_DATE End ) Years
FROM Tbl T1,Tbl T2 
WHERE T1.Start_Date  >= @Start_Date 
      AND T2.Start_Date >= @Start_Date
      AND T1.End_Date <= @End_Date 
      AND T2.End_Date <= @End_Date