在此示例中写入重叠时间的查询

Question

想象一下，我有一张包含以下数据的表格：

我想写一个查询，给出： 有重叠时间的客户，例如：

Row 2,3
because customer of these are the same and the overlapping time

Answer 1

以下是使用SELF-JOIN的方法。对于大型表格而言，这可能效率不高：

SELECT t1.* 
FROM TestData t1
INNER JOIN TestData t2
    ON t2.Customer = t1.Customer
    AND t2.EndDate >= t1.StartDate
    AND t2.StartDate <= t1.EndDate
    AND t1.Row <> t2.Row

SQL Fiddle

Answer 2

SELECT a.Row
      ,a.customer
      ,a.start
       ,a.end
      ,b.ColumnId AS OverlappedId 
      ,b.InTime   AS OverlappedInTime 
      ,b.OutTime  AS OverlappedOutTime 
  FROM Time  AS a 
  JOIN Time  AS b ON ((a.start BETWEEN b.start AND b.end) 
                       OR  (a.end BETWEEN b.start AND b.end)) 
                      AND  (a.row!= b.row)