#book

Question

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(*)

 

Answer 1

R ⋈_{<A = A> AND <B = B>} S Then 

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