仅加入两个表的分区

Question

SQL Server 2008

Table A looks like:

A_ID  v1   v2   v3
---------------------------
 1    d    e    f
 1    a    b    c
 1    a    b    d
 2    d    a    b
 2    e    f    g
 3    d    e    f
 3    e    f    g
 3    d    a    b

and Table B is similar:

B_ID  v1   v2   v3
---------------------------
 Q    a    b    c
 Q    b    a    c
 Q    a    b    d
 R    d    e    f
 R    a    b    c
 R    d    e    f
 P    e    f    g
 P    d    a    b

What I need back from these two tables are the (A_ID, B_ID) pairs, if any, where each row of Table B where B_ID = any one value has one matching row in Table A where A_ID = any one value. In other words, I need to the complete matching set in A for each full set of triples in B--no super sets or subsets. The value of B_ID and A_ID is immaterial.

I thought partitioning would be the way to go, since I already have the column that naturally partitions A and B, and I also thought I could pre-select which paritions where JOINed by ensuring only partitions with matching numbers of rows would be attempting. I haven't been able to do either--partitioning both tables was easy, but I see no way to tell the join to only act on the partitions.

In this example, (2,P) would be returned because all rows in Set P match all rows in Set 2. Result (1, R) would NOT be returned because all rows of Set R are not matched by all rows of Set 1, etc.

Answer 1

Using symetric difference :

SELECT DISTINCT a1.A_ID, b1.B_ID
FROM A a1,B b1
WHERE NOT EXISTS (
                   (SELECT v1,v2,v3
                   FROM A WHERE A.A_ID = a1.A_ID
                   EXCEPT
                   SELECT v1,v2,v3
                   FROM B WHERE B.B_ID = b1.B_ID
                   ) 
                   UNION ALL
                   (
                   SELECT v1,v2,v3
                   FROM B WHERE B.B_ID = b1.B_ID
                   EXCEPT
                   SELECT v1,v2,v3
                   FROM A WHERE A.A_ID = a1.A_ID)
                 );

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