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hi this is the third ninth video in my dbms question set in this question we are asked to write relational algebra queries for these four instances relational algebra is a procedural query language which uses operators to write the queries we have different types of operators for different types of queries in this question we are asked to write search queries so we will be using the selection operator in the first question it says write the relational algebra query to find the details of the brand Puma product in the first question it says write the relational algebra query to find the details of the brand Puma product use brand ideas for here we have given the selection operator this is the selection operator then we have given the condition as brand ID equals 4 then inside brackets again we have given the relation as the product table in the second question it says write the relational algebra query to find the details of the gender male uses among the registered uses to do this use