Grokking SQL for Tech Interviews
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4. Employee Performance and Improvement Rate (Easy)
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Problem Statement

Table: Performance
Each row in this table represents a performance evaluation of an employee, detailing the employee's name, the evaluation result, the evaluation round, and the performance score.

+----------------+---------+
| Column Name    | Type    |          
+----------------+---------+
| employee_name  | varchar |           
| evaluation     | varchar |       
| round          | int     |          
| score          | int     |    
+----------------+---------+
This table may have duplicate rows.

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