在SQL中以分钟重叠的两个日期范围

Question

是否有一种简单的方法可以在SQL中的两个日期范围内以分钟为单位获得重叠？我正在使用PostgreSQL。

Answer 1

该函数将处理4个时间戳的任何输入。

CREATE OR REPLACE FUNCTION date_overlap(start1 timestamp, end1 timestamp, start2 timestamp, end2 timestamp) RETURNS int STRICT AS ' 

    -- STRICT returns NULL if any input is NULL 

    BEGIN 

    -- for valid ranges, end1 must be after (or equal to) start1, end2 must be after (or equal to) start2 
    -- for valid overlap, either end1 is after (or equal to) start2 or end2 is after (or equal to) start1 

    IF end1 < start1 OR end2 < start2 OR start1 < start2 AND end1 < start2 OR start2 < start1 AND end2 < start1 THEN 
     RETURN NULL; 
    ELSE 
     IF start1 > start2 THEN 
     IF end1 < end2 THEN 
      RETURN EXTRACT (EPOCH FROM end1 - start1) :: int/60; 
     ELSE 
      RETURN EXTRACT (EPOCH FROM end2 - start1) :: int/60; 
     END IF; 
     ELSE 
     IF end2 < end1 THEN 
      RETURN EXTRACT (EPOCH FROM end2 - start2) :: int/60; 
     ELSE 
      RETURN EXTRACT (EPOCH FROM end1 - start2) :: int/60; 
     END IF; 
     END IF; 
    END IF;  
    END; 
' LANGUAGE 'plpgsql' 

用法：

SELECT date_overlap(timestamp1, timestamp2, timestamp3, timestamp4) FROM myTable 

返回：＃分钟为INT

Answer 2

假设每个日期范围包含两个日期字段;第一个范围：date1，date2，第二个范围：date3，date4，第一个范围在第二个范围开始后结束。

SELECT (date3 - date2) * interval '1 minute' FROM myTable 

未测试，但应该工作。

Answer 3

**

Declare @Table Table 
( 
    RowId Int Identity(1, 1) Not Null, 
     Id NChar(3) Not Null, 
     StartDate DATETIME Not Null, 
     EndDate DATETIME Not Null 
); 

Insert Into @Table (Id, StartDate, EndDate) 
Select 'id1', '20131210 10:10', '20131220 10:10' Union All 
Select 'id1', '20131211', '20131215' Union All 
Select 'id1', '20131201', '20131205' Union All 
Select 'id1', '20131206', '20131208' Union All 
Select 'id1', '20131225 10:10', '20131225 10:11' 
Select * 
From @Table; 


With Overlaps (OverlapRowId, BaseRowId, OStart, OEnd, BStart, BEnd) 
As 
( 
     Select Overlap.RowId, Base.RowId, Overlap.StartDate, Overlap.EndDate, Base.StartDate, Base.EndDate 
     From @Table As Base 
     Inner Join @Table As Overlap On Overlap.Id = Base.Id 
     Where (((Overlap.StartDate > Base.StartDate) And (Overlap.StartDate < Base.EndDate)) 
      Or ((Overlap.StartDate = Base.StartDate) And (Overlap.EndDate > Base.EndDate))) 
      And (Base.RowId != Overlap.RowId) 
) 
-- Remove records that were found to cause overlap issues. 
Delete T 
From @Table As T 
Inner Join 
( 
     Select O.OverlapRowId 
     From Overlaps As O 
     Left Join Overlaps As Fp On Fp.OverlapRowId = O.BaseRowId 
     Where (Fp.OverlapRowId Is Null) 
) As SubQuery On SubQuery.OverlapRowId = T.RowId; 

-- Select the valid options. 
Select RowId, Id, StartDate, EndDate 
From @Table where StartDate<EndDate; 
Go 

**