MySQL Subquery Exercises: Query to get 3 maximum salaries
MySQL Subquery: Exercise-20 with Solution
Write a MySQL query to get 3 maximum salaries.
Sample table: employees
Code:
-- Selecting distinct salary values from the employees table
SELECT DISTINCT salary
-- Selecting data from the employees table, aliasing it as 'a'
FROM employees a
-- Filtering the result set to include only salary values where there are at most 3 distinct salary values greater than or equal to it
WHERE 3 >=
-- Subquery to count the number of distinct salaries greater than or equal to each salary
(SELECT COUNT(DISTINCT salary)
-- Selecting data from the employees table, aliasing it as 'b'
FROM employees b
-- Filtering the result set to include only distinct salaries greater than or equal to the salary in the outer query (a.salary)
WHERE b.salary >= a.salary)
-- Sorting the result set in descending order based on salary
ORDER BY a.salary DESC;
Explanation :
- This MySQL code selects distinct salary values from the "employees" table.
- It filters the results to only include salary values where there are at most 3 distinct salary values greater than or equal to it.
- This is achieved using a subquery where the number of distinct salaries greater than or equal to each salary is counted. The outer query compares this count with the constant value 3.
- The result set is then sorted in descending order based on salary using the ORDER BY clause.
MySQL Subquery Syntax:
- The subquery (inner query) executes once before the main query (outer query) executes.
- The main query (outer query) use the subquery result.
MySQL Code Editor:
Structure of 'hr' database:
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