There are group of parents having children, lets say P1 ==> [C1,C2], P2==>[C3,C2], P3==>[C1], and many other combinations but I want to get only those parents who has only C1 child or who has only [C2,C3].
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There are group of parents having children, lets say P1 ==> [C1,C2], P2==>[C3,C2], P3==>[C1], and many other combinations but I want to get only those parents who has only C1 child or who has only [C2,C3].