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# 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).

##### Solution Summary

Relational algebra is applied.

##### Solution Preview

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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