Question No: $02$

This is a subjective question, hence you have to write your answer in the Text$-$Field given below.

Consider the following relations that have Suppliers information, Product information, and a Catalog that includes products from many suppliers: Supplier $($Sid$,$ Sname, Address$)$

Product $($Pid$,$ Pname, Color$)$

Catalog $($Sid$,$ Pid, Price$)$

Write the following queries in Relational Algebra

$[1+1+1+2$ marks $]$

a$.$ List names of products with blue color

b$.$List Sids of suppliers who supply some yellow product.

c$.$ List names of suppliers who supply some red product or are located at $\text{'}123$ Main Street'.

d$.$List Pids of the products supplied by at least $2$ suppliers