Compute natural join and outer join, Database Management System

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For the relations R and S given below:

R                      S

A

B

C

1

4

7

2

5

8

3

6

9

Compute

 (i) ΠA,C(R) (ii) σB=2(S)

 (iii) natural join (iv) outer join

A

C

1

3

4

6

7

9

(ii)

B

C

D

2

3

10

2

3

11

(iii)

A

B

C

D

1

2

3

10

1

2

3

11

(iv) Assuming left outer join

A

B

C

D

1

2

3

10

1

2

3

11

4

5

6

NULL

7

8

9

NULL


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