插入查询

Question

我有一个temptable临时存储数据，其中第一个字段是从查询中填充的，第二个字段是静态值

不是Temptable：

• roomid。
• isavailable。

现在我使用以下查询填充第一个字段，但是如何同时填充这两个字段？

以下是仅填充第一个字段的查询

insert into temptable (RoomID)
select t1.RoomId as RoomID 
from Room t1 
INNER JOIN 
(
      select RoomID, SUM(quantity) as QTY 
      from Room_Item 
      group by RoomID 
      having SUM(Quantity) > 0
 ) t2 on t1.RoomID = t2.RoomID 
 order by RoomID

Answer 1

INNER JOIN实际上只在房间可用时返回行。

你应该

• 使用LEFT JOIN保留所有记录
• 使用CASE语句确定房间是否可用。

SQL声明

insert into temptable (RoomID, IsAvailable) 
select  t1.RoomId as RoomID 
        , case when t2.qty IS NOT NULL then 1 ELSE 0 END
from    Room t1 
        LEFT OUTER JOIN (
          select  RoomID, SUM(quantity) as QTY 
          from    Room_Item 
          group   by
                  RoomID 
          having  SUM(Quantity) > 0
        ) t2 on t1.RoomID = t2.RoomID 

Answer 2

只需将静态值直接传递给SELECT语句

即可

INSERT INTO temptable (RoomID, isavailable)
SELECT t1.RoomId, 1 // static  value
FROM Room t1 
INNER JOIN 
(
    SELECT RoomID, SUM(quantity) AS QTY 
    FROM Room_Item 
    GROUP BY RoomID 
    HAVING SUM(Quantity) > 0
) t2 ON t1.RoomID = t2.RoomID 
ORDER BY RoomID

Answer 3

也许是这样的：

;WITH CTE
AS
(
    select  
        RoomID, 
        SUM(quantity) OVER(PARTITION BY byRoomID) as QTY
    from    
        Room_Item 
)
insert into temptable 
(
    RoomID, 
    IsAvailable
) 
select  
    Room.RoomId, 
    (
        CASE 
            WHEN CTE.qty IS NOT NULL 
            THEN 1 
            ELSE 0 
        END
    ) AS IsAvailable
from    
    Room 
    LEFT JOIN CTE
        ON t1.RoomId=CTE.RoomID
        AND CTE.QTY>0

Answer 4

insert into temptable (RoomID, IsAvailable) 
select  t1.RoomId as RoomID 
, case when t2.qty IS NOT NULL then 1 ELSE 0 END
from    Room t1 
LEFT OUTER JOIN (
  select  RoomID, SUM(quantity) as QTY 
  from    Room_Item 
  group   byRoomID 
  having  SUM(Quantity) > 0
) t2 on t1.RoomID = t2.RoomID 

这可能会帮助您获得结果..

干杯... !!!