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Editorial Team
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Asked: 2026-06-18T14:05:20+00:00

Could you please explain to me how to do a NATURAL JOIN on these

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Could you please explain to me how to do a NATURAL JOIN on these two relations (one having 5 and the other one 3 rows?

1st relation

A   C
3   3
6   4
2   3
3   5
7   1

2nd relation

B   C   D
5   1   6
1   5   8
4   3   9
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1 Answer

  1. Editorial Team

    In your question you have two separate relations, which have one attribute (i.e. column) in common: C.

    A natural join will combine all tuples in both relations with that attribute in common. You will end up with the results:

    A B C D    

7 5 1 6  
3 4 3 9
2 4 3 9
3 1 5 8

    This can be performed in SQL by using the code @Matthew posted.

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