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A B C
1 a c
2 b b
3 c a
4 c c
A B D
1 a a
1 b b
3 c c
4 c d

 

these are two table R AND S FIND NATURAL JOIN(*)

 

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R ⋈<A = A> AND <B = B> S Then 

A B C D
1 a c a
3 c a c
4 c c d

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