如何使用CTE将位连接到varbinary

Question

我在下面的订单中有一个包含ID和位的表：

ID  Bit
1   0
1   0
1   1
1   0
1   0
1   0
1   1
1   0
1   1
1   0
1   ...
... ...
2   0
2   1
2   0
2   0
2   1
2   0
2   0
2   0
2   1
2   0
2   ...
... ...
n   ...

如何对ID列进行分组并使用CTE将Bit列连接到varbinary列？

ID  Bits
1   0x...
2   0x...

提前致谢...

Answer 1

这应该有用......

declare @bits TABLE(ID INT, myBit BIT, Position INT);
insert into @bits values(1,0,0)
                       ,(1,0,1)
                       ,(1,1,2)
                       ,(1,0,3)
                       ,(1,0,4)
                       ,(1,0,5)
                       ,(1,1,6)
                       ,(1,0,7)
                       ,(1,1,8)
                       ,(1,0,9)

                       ,(2,0,0)
                       ,(2,1,1)
                       ,(2,0,2)
                       ,(2,0,3)
                       ,(2,1,4)
                       ,(2,0,5)
                       ,(2,0,6)
                       ,(2,0,7)
                       ,(2,1,8)
                       ,(2,0,9);
WITH myIDs AS
(
    SELECT DISTINCT ID
    FROM @bits
)
SELECT '0x' + concatenatedBits.string
FROM myIDs
CROSS APPLY
(
    SELECT
    (
    SELECT CAST(myBit AS VARCHAR(1))
    FROM @bits AS b
    WHERE b.ID=myIDs.ID
    ORDER BY Position
    FOR XML PATH(''),TYPE
    ).value('.','varchar(max)')
) AS concatenatedBits(string)