合并同列字段，即相同ID的字符串叠加

 set statistics     io on  set statistics     time on   SELECT   distinct o.OrderID,f.Flight,f.DPort,f.APort,f.TakeOffTime,f.ArrivalTime,f.SubClass, f.Sequence,ISNULL(f.RecordNo,'')AS Pnr,o.FlightClass,c.ContactName, [value]=(select stuff((select ',' + PassengerName from O_Passenger p1 (nolock) where p1.orderid =  o.OrderID for xml path('')) , 1 , 1 , ''))

FROM dbo.O_Flight f (nolock) JOIN dbo.O_Orders o (nolock) ON f.OrderID=o.OrderID JOIN dbo.O_Contact c (nolock) ON o.OrderID=c.OrderID JOIN dbo.O_Passenger p  (nolock) ON p.OrderID=o.OrderID WHERE Flight='MU5870'

 

核心函数是stuff

 [value]=(select stuff((select ',' + PassengerName from O_Passenger p1 (nolock) where p1.orderid =  o.OrderID for xml path('')) , 1 , 1 , ''))

可以自己实现数据库函数列合并核心代码如下：

declare @S nvarchar(500)='' 
select @S=isnull(@S,'')+isnull( FailureSource,'')+',' from OrderPayFailure 
SELECT @S