Which SQL query is analogous to the Entity Framework query for retrieving all employees with the last name 'Pérez'?

Which SQL query is analogous to the Entity Framework query for retrieving all employees with the last name 'Pérez'?

• A. SELECT * FROM Employees WHERE lname = 'Pérez'
• B. SELECT employee FROM Employees WHERE lname != 'Pérez'
• C. SELECT employee FROM Employees WHERE lname LIKE 'Pérez'
• D. SELECT lname FROM Employees WHERE lname = 'Pérez'

Answer: (A)

The correct answer, which involves retrieving all employees with the last name 'Pérez', utilizes a straightforward SQL syntax that specifies the selection from the "Employees" table where the last name matches exactly 'Pérez'. This SQL query effectively returns all columns for entries that meet the specified condition. By selecting all rows that possess the last name 'Pérez', this query accurately reflects the intent of the query that the Entity Framework would generate, as it seeks complete records of matching employees. Using an equality comparison with the WHERE clause is essential for ensuring that only relevant records are retrieved. In contrast, the other options either represent different criteria or incomplete requests that do not align with the goal of retrieving all employees with that specific last name. For instance, selecting entries where the last name does not equal 'Pérez' would yield a completely different result set that is not relevant to this query's intent. Similarly, using a LIKE operator without any wildcard characters does not introduce any functional improvements over the equality operator in this context and would also return results identical to the correct query if only looking for an exact match. Finally, selecting only the last name would not provide the complete employee records, making it less effective for the desired outcome.

The correct answer, which involves retrieving all employees with the last name 'Pérez', utilizes a straightforward SQL syntax that specifies the selection from the "Employees" table where the last name matches exactly 'Pérez'. This SQL query effectively returns all columns for entries that meet the specified condition.

By selecting all rows that possess the last name 'Pérez', this query accurately reflects the intent of the query that the Entity Framework would generate, as it seeks complete records of matching employees. Using an equality comparison with the WHERE clause is essential for ensuring that only relevant records are retrieved.

In contrast, the other options either represent different criteria or incomplete requests that do not align with the goal of retrieving all employees with that specific last name. For instance, selecting entries where the last name does not equal 'Pérez' would yield a completely different result set that is not relevant to this query's intent. Similarly, using a LIKE operator without any wildcard characters does not introduce any functional improvements over the equality operator in this context and would also return results identical to the correct query if only looking for an exact match. Finally, selecting only the last name would not provide the complete employee records, making it less effective for the desired outcome.