查找重叠日期和返回重叠记录

Question

我需要的是返回可能相互重叠的所有记录。

-- Create Temp Table 
CREATE TABLE #Overlap 

(SubType varchar(50), 
Cause varchar(9), 
CircuitID varchar(100), 
BegDate date, 
EndDate date, 
AmtSought decimal(11,2), 
Remarks varchar(max)) 

--Insert records 

INSERT INTO #Overlap VALUES('Original','201500018','36/KQ--/831670/IP /NUVX/','2016-12-01','2016-12-31',354.41,'Rec 1') 
INSERT INTO #Overlap VALUES('Original','201500009','36/VCID/826061/IP/NUVX','2016-08-11','2016-08-12',200.50,'Rec 2') 
INSERT INTO #Overlap VALUES('Original','201500018','36/KQ--/831670/IP /NUVX/','2016-11-15','2016-12-14',100.25,'Rec 3') 
INSERT INTO #Overlap VALUES('Original','201500018','36/KQ--/831670/IP /NUVX/','2016-12-16','2017-01-15',300.75,'Rec 4') 
INSERT INTO #Overlap VALUES('Original','201500018','36/KQ--/831670/IP /NUVX/','2017-01-01','2017-01-01',500.00,'Rec 5') 
INSERT INTO #Overlap VALUES('Original','201500009','36/VCID/826061/IP/NUVX','2016-07-01','2016-07-31',100.50,'Rec 6') 

我的结果会是什么样子：

SubType Cause  CircuitID     BegDate EndDate AmtSought Remarks 
------------------- -------------------------- ---------- ---------- --------- -------- 
Original 201500018 36/KQ--/831670/IP /NUVX/ 2016-11-15 2016-12-14 100.25 Rec 3 
Original 201500018 36/KQ--/831670/IP /NUVX/ 2016-12-01 2016-12-31 354.41 Rec 1 
Original 201500018 36/KQ--/831670/IP /NUVX/ 2016-12-16 2017-01-15 300.75 Rec 4 
Original 201500018 36/KQ--/831670/IP /NUVX/ 2017-01-01 2017-01-01 500.00 Rec 5 

我已经试过这从我看到的样本代码，但它未返回所需的结果。

Select * from #Overlap a 
Inner Join #Overlap b 
on a.SubType = b.SubType 
And a.Cause = b.Cause 
And a.CircuitID = b.CircuitID 
And b.BegDate between a.BegDate and a.endDate 
And b.BegDate < a.endDate 

Answer 1

假设你#Overlap表中有一个主键（或唯一键）TableId

您可以使用此下面的查询

SELECT * FROM #Overlap o 
WHERE EXISTS 
(
    SELECT 1 FROM #Overlap o2 
    WHERE o2.SubType = o.SubType 
    AND o2.Cause = o.Cause 
    AND o2.CircuitID = o.CircuitID 
    AND (
      o2.BegDate BETWEEN o.BegDate AND o.EndDate 
      OR o2.EndDate BETWEEN o.BegDate AND o.EndDate 
      OR o.BegDate BETWEEN o2.BegDate AND o2.EndDate 
      OR o.EndDate BETWEEN o2.BegDate AND o2.EndDate 
     ) 
    AND o2.TableId != o.TableId 
) 
ORDER BY o.SubType, o.Cause, o.BegDate 

演示链接：http://rextester.com/KBFX30109

正如@ HABO的建议，你也可以用来检查重叠

AND o2.BegDate <= o.EndDate 
    AND o.BegDate <= o2.EndDate 

Answer 2

您需要检查开始重叠和结束重叠。如果startdate总是小于endDate，则可以使用以下查询。如果您有一些主键，则不需要CTE：

; WITH CTE AS 
(
    SELECT *, 
    ROW_NUMBER() OVER(
      PARTITION BY (SELECT NULL) 
      ORDER BY (SELECT NULL) 
    ) AS pk FROM #Overlap 
) 
SELECT a.*, b.pk, b.BegDate, b.endDate FROM CTE a 
CROSS JOIN CTE b 
WHERE -- Simplify by adding PK 
(a.pk <> b.pk) 
AND (CASE WHEN (a.BegDate > b.BegDate) THEN a.BegDate ELSE b.BegDate END) 
<= (CASE WHEN (a.endDate < b.endDate) THEN a.endDate ELSE b.endDate END)