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Which of the following operations requires two tables as input having at least one common column?
1. Select
2. Join
3. Projection
4. Cartesian product

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Correct Answer - Option 2 : Join

Symbol

Name

Example

σ

selection

σA = 500(R) → Return rows whose A attribute is equal to 500 and no duplicates are allowed

Projection

B(R) → Output the column B and no duplicate are allowed

natural join

R ⋈ S → Output pairs of rows from the two input relations that have the same value on all attributes that have the same value

×

cartesian product

R × S → Output all pairs of rows from the two input relations

Conclusions:

Select and project is applied to one table.

cartesian product requires two tables but need not have common attributes

Join or natural join or full outer join operations requires two tables as input having at least one common column

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