连接/联合两个表的Sql查询
我正在寻找一些建议,以构建一个查询来连接表a和表B,从而将输出作为表C。看起来我需要能够合并这两个表并构建一个跨表查询。下面显示的数据只是示例,因为两个表中的日期每个月都在变化。注:两个表中的日期不会重叠。例如,下表B的未来日期永远不会是6月或7月。反之亦然连接/联合两个表的Sql查询,sql,sql-server-2005,tsql,stored-procedures,Sql,Sql Server 2005,Tsql,Stored Procedures,我正在寻找一些建议,以构建一个查询来连接表a和表B,从而将输出作为表C。看起来我需要能够合并这两个表并构建一个跨表查询。下面显示的数据只是示例,因为两个表中的日期每个月都在变化。注:两个表中的日期不会重叠。例如,下表B的未来日期永远不会是6月或7月。反之亦然 Table A Product Location HistoryDate HistorySales ... more columns A X June 100 A X
Table A
Product Location HistoryDate HistorySales ... more columns
A X June 100
A X July 200
Table B
Product Location FutureDate FutureSales ... more columns
A X August 150
A X Sept 50
Table C
Product Location June July August September ... other columns from A & B
A X 100 200 150 50
感谢您的帮助。这已经在SQL Server 2008 R2中进行了测试。我相信这里的一切在2005年也会起作用。据我记忆所及,2005年推出了PIVOT和OVER等产品。如果你发现任何问题就告诉我
DECLARE @Products TABLE
(
ID INT IDENTITY(1, 1)
, Name VARCHAR(30)
);
INSERT INTO @Products
VALUES ('Dummies Guide to Querying'), ('SQL Design Patterns');
DECLARE @OldProducts TABLE
(
ID INT IDENTITY(1, 1)
, ProductID INT
, Location CHAR(2)
, HistoryDate DATE
, Sales INT
);
INSERT INTO @OldProducts
VALUES (1, 'CO', '20100601', 100)
, (1, 'CO', '20100701', 200)
, (1, 'CA', '20100526', 150)
, (2, 'CA', '20100601', 175);
DECLARE @NewProducts TABLE
(
ID INT IDENTITY(1, 1)
, ProductID INT
, Location CHAR(2)
, FutureDate DATE
, PredictedSales INT
);
INSERT INTO @NewProducts
VALUES (1, 'CO', '20110401', 200)
, (1, 'CO', '20110601', 250)
, (1, 'CA', '20110401', 150)
, (2, 'CA', '20110301', 180)
, (3, 'WA', '20110301', 100);
WITH AllProduts AS
(
SELECT
Products.Name
, OldProducts.Location
, DATENAME(MONTH, OldProducts.HistoryDate) AS MonthValue
, OldProducts.Sales
FROM @OldProducts AS OldProducts
INNER JOIN @Products AS Products
ON Products.ID = OldProducts.ProductID
UNION ALL
SELECT
Products.Name
, NewProducts.Location
, DATENAME(MONTH, NewProducts.FutureDate) AS MonthValue
, NewProducts.PredictedSales AS Sales
FROM @NewProducts AS NewProducts
INNER JOIN @Products AS Products
ON Products.ID = NewProducts.ProductID
)
SELECT
Name
, Location
, [January]
, [Febuary]
, [March]
, [April]
, [May]
, [June]
, [July]
, [August]
, [September]
, [October]
, [November]
, [December]
FROM AllProduts
PIVOT
(
SUM(Sales)
FOR MonthValue
IN
(
[January]
, [Febuary]
, [March]
, [April]
, [May]
, [June]
, [July]
, [August]
, [September]
, [October]
, [November]
, [December]
)
) PivotedTable
ORDER BY Name, Location;
您可能需要动态SQL,或者只需硬编码所有12个月,并使用空值,或者让Month1、Month2、Month3、Month4,然后以其他方式传回这些列所代表的内容。@Daniel,pivot正是他想要的。问题太模糊了。A/B中的日期是否表示为月份名称的字符串,并且每个月只有一条记录?如果A和B之间的记录“不会重叠”,那么A和B之间的记录永远不会超过12条吗?这并不明显,但我猜还有其他的产品+位置组合?考虑到C中的一行由A和B中的多行组成,您计划如何在C中显示“A和B中的其他列”-数据来自A/B中的哪一行?