Top 100 SQL Interview Questions
The top 100 SQL interview questions with clear, expert-written answers covering joins, aggregation, window functions, and more.
- Find Highest Salary in Employees Table
- Find Second Highest Salary Employees Table
- Find Third Highest Salary Employees Table
- Find Nth Highest Salary Employees Table
- Retrieve Employees With Highest Salary Records
- Find Employees With Second Highest Salary
- Find Highest Paid Employee Per Department
- Find Second Highest Salary Per Department
- Find Third Highest Salary Per Department
- Find Top Three Employees Per Department
- Find Lowest Salary Per Employee Department
- Calculate Average Salary Per Department
- Calculate Salary Aggregates for Employees Table
- Filter Departments By Average Salary Comparison
- Filter Employees Above Average Department Salary
- Query Employees With Above Average Salary
- Find Employees Below Department Average Salary
- Find Department With Highest Average Salary
- Find Department With Highest Salary Expenditure
- Find Department With Most Employees Records
- Filter Employees Table by Department Count
- Filter Employees Table by Average Salary
- Self Join Employees Table Salary Comparison
- Self Join Employees Table Salary Comparison
- Self Join Employees Table Salary Comparison
- Find Employees Without Manager ID Column
- Filter Employees Table by Manager Count
- Find Highest Paid Manager Employees Table
- Find Employee With Most Direct Reports
- Self Join Employees Table for Dates
- Self Join Employees Table for Dates
- Self Join Employees Table by Year
- Self Join Employees Table Department Comparison
- Find Employees Without Direct Reports
- Self Join Employees Table for Managers
- Self Join Employees Table for Salaries
- Calculate Salary Difference Using Self Join
- Query Employees With Higher Salary Than Department
- Find Employees With Higher Department Salaries
- Find Employees With Matching Salary Values
- Identify Duplicate Records in Employees Table
- Identify Duplicate Employee Name and Department
- Find Duplicate Email Records in Customers
- Delete Duplicate Records in Employees Table
- Delete Duplicate Records in Employees Table
- Find Duplicate Emails in Employees Table
- Find Duplicate Names in Employees Table
- Find Duplicate Names in Departments Table
- Identify Duplicate Records in Customers Table
- Find First Occurrence of Duplicate Records
- Select Top Five Highest Paid Employees
- Retrieve Five Lowest Paid Employees Records
- Find Top 10 Employees By Salary
- Retrieve Top Three Unique Employee Salaries
- Select Three Distinct Employee Salary Values
- Retrieve Nth Highest Distinct Employee Salary
- Count Employees per Distinct Salary Value
- Find Most Frequent Salary In Employees
- Find Second Most Frequent Employee Salary
- Select Employees With Top Three Salaries
- Query Employees Joined Last Thirty Days
- Query Employees Joined Last Six Months
- Select Employees Joined This Current Year
- Query Employees Joined During Last Year
- Count Employees Hired Per Each Year
- Count Employees Hired Per Month Grouping
- Find Month With Highest Employee Hires
- Find Earliest Hired Employee in Employees
- Find Most Recently Hired Employees Record
- Query Employees With Five Years Tenure
- Query Employees Table by Date Salary
- Query Employees by Hire Date Range
- Calculate Average Employee Tenure By Department
- Find Department With Highest Average Tenure
- Find Oldest Employee per Department Query
- Find Newest Employee Per Department Query
- Find Employees With Same Joining Date
- Group Employees by Joined Day Name
- Count Employees Hired By Weekday
- Find First Hired Employee Per Department
- Rank Employees by Salary Using Rank
- Rank Employees by Salary per Department
- Find Top Salary Employees Per Department
- Find Employees With Salary Rank Two
- Assign Row Numbers to Employees Table
- Find Top Two Employees Per Department
- Query Top Ten Percent Department Salaries
- Calculate Employee and Department Average Salary
- Retrieve Employee Salary and Department Maximum
- Calculate Employee Salary Difference From Average
- Calculate Running Total of Employee Salaries
- Calculate Cumulative Hires in Employees Table
- Retrieve Previous Employee Salary Using LAG
- Retrieve Next Employee Salary Using LEAD
- Compare Employee Salaries Using LAG Function
- Calculate Maximum Salary Increase Between Employees
- Calculate Salary Difference Using LAG Function
- Find First and Last Employee Salaries
- Find Highest and Lowest Employee Salaries
- Calculate Employee Salary Percentage by Department