SQL Server 2005 中的联合

Question

以下是我的查询

 Select vehicleID from trip where (StartingDate between ''+ convert(varchar(10), @StartDate,111) +'' and ''+ convert(varchar(10), @EndDate,111)+'')
or (enddate between ''+ convert(varchar(10), @StartDate,111) +'' and ''+ convert(varchar(10), @EndDate,111)+'')
or(StartingDate <= @StartDate and enddate >= @EndDate)
UNION
Select vehicleID from VehicleMaintenance where (FromDate between ''+ convert(varchar(10), @StartDate,111) +'' and ''+ convert(varchar(10), @EndDate,111)+'')
or (todate between ''+ convert(varchar(10), @StartDate,111) +'' and ''+ convert(varchar(10), @EndDate,111)+'')
or (FromDate <= @StartDate and todate >= @EndDate)
) as vehicle

如何从上面的查询结果中选择不同的vehicleId....

Answer 1

请注意，UNION 将删除重复项（而 UNION ALL 不会），因此您应该已经拥有唯一的车辆 ID