Question

我又是新来的。我再次说，因为我的第一个SQL入门是在1992年的AS400上。

我意识到有一些类似的帖子。我试图从每个人的想法中解决我的问题，但很少没有成功。这是我想要做的。有3个表。两个源表和一个目标表。源表是Tickets和TicketEntities，目标表是DelTimes。

Tickets有列：

(Id (primary), TicketNumber, LastUpdateTime and LastOrderDate, DepartmentId)

TicketEntities有列：

(Ticket_Id, EntityTypeId, EntityName)

目标表DelTimes具有：

(TicketId, TicketNo, TicketDate, LOTime, LOMinutes, DriverNam)

lastOrderDate和LastUpdateTime是日期和时间的组合，我必须从使用转化中提取信息。

到目前为止，这是错误的多部分标识符问题。

IF EXISTS (SELECT * FROM Tickets, TicketEntities Where Tickets.DepartmentId = 2 and EntityTypeId = 3)
    UPDATE DelTimes
            SET TicketId =Tickets.Id, 
                DelTimes.TicketNo = Tickets.TicketNumber, 
                DelTimes.TicketDate = CONVERT(Date,Tickets.LastOrderDate,5),
                DelTimes.LOTime = Convert(datetime,Tickets.LastOrderDate,8), 
                DelTimes.LOMinutes = DATEDIFF(minute,Tickets.LastOrderDate,Tickets.LastUpdateTime),
                DelTimes.DriverNam = TicketEntities.EntityName
ELSE
    INSERT INTO DelTimes (TicketId, TicketNo, TicketDate, LOTime, LOMinutes, DriverNam)
                         VALUES (Id, TicketNumber, CONVERT(Date,LastOrderDate,5), 
                         Convert(datetime,LastOrderDate,8),
                         DATEDIFF(minute,LastOrderDate,LastUpdateTime),
                                      EntityName)

感谢您解决此问题的帮助！

Answer 1

不是说这是答案，因为你没有变量，表之间的连接或WHERE子句。但是对于刚刚开始的人来说，它可能最终会看起来像：

     UPDATE DelTimes
                SET DelTimes.TicketNo = Tickets.TicketNumber, 
                    DelTimes.TicketDate = CONVERT(Date,Tickets.LastOrderDate,5),
                    DelTimes.LOTime = Convert(datetime,Tickets.LastOrderDate,8), 
                    DelTimes.LOMinutes = DATEDIFF(minute,Tickets.LastOrderDate,
Tickets.LastUpdateTime),
                    DelTimes.DriverNam = @DriverName
        FROM DelTimes
        JOIN Tickets ON DelTimes.TicketId = Tickets.TicketId
        JOIN TicketEntities ON TicketEntities.Ticket_Id =  Tickets.TicketId 
        WHERE DelTimes.TicketId = @TicketId
              AND TicketEntities.EntityTypeId = 3


    IF @@ROWCOUNT = 0
        INSERT INTO DelTimes (TicketId, TicketNo, TicketDate, LOTime, LOMinutes, DriverNam)
             VALUES (@TicketId, @TicketNumber, CONVERT(Date,@LastOrderDate,5), 
                Convert(datetime,@LastOrderDate,8),
                DATEDIFF(minute,@LastOrderDate,@LastUpdateTime),  
                @DriverName)

我可能在这里弊大于利，而且我们不喜欢这个，但这会让你开始。（到下一轮问题。）

如果不是EXISTS INSERT ELSE UPDATE使用3个表避免重复

1 个答案: