试试这个，

1.First load the relation in one alias with only one column say 'a',
2.Found its count(no. of rows)
3.Then load the second relation in another alias with only one column say 'b',
4.Found its count(no. of rows)
5.Join(Inner) the above two relations using columns a and b
6.then count the number of rows in the joined relation
7.compare the first relation count with join relation count or compare the second relation count with join relation count, if it is equal then both relations having same data.