# Relational Algebra

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From the following relations, write the Relational Algebra to:

Find the part(s) that have been supplied by more than one vendor during February.

Vendors(vend#, vend_name, vend_phone)

Parts(part#, part_desc, part_price)

Supplys(vend#, part#, supply_date).

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##### Solution Summary

Relational algebra is applied.

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Attached please find the answer.

In relational algebra, there are six basic operators:

1. Select (σ)

2. Project (π)

3. Union ( )

4. Cartesian product ( x )

5. Set difference (-)

6. Rename (ρ)

In order to write this query in relation algebra, I will break the query into parts and then combine the result.

Given the following relations;

Vendors(vend#, vend_name, vend_phone)

Parts(part#, part_desc, part_price)

Supplys(vend#, part#, supply_date)

Find the part(s) that have been supplied by more than one vendor during February.

Steps:

1. Let's find ...

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