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Interview Question- Fetching records based on column

DileepReddyC asked:

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Hi all,

I was asked a question in interview.Suppose an employee table with columns ID,Name,Age,
Sex,Designation and there are lakhs of records.

Query is
Select Name,Age,Sex from Employee where Designation=@EmpDesignation.

WHat is alternative query to improve the performance on database.How can we do that

Thanks in advance
Tags: SQL-Server

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