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SQL exercises on employee Database: Find the highest salary from all the employees

SQL employee Database: Exercise-90 with Solution

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90. From the following table, write a SQL query to find the highest salary. Return highest salary.

Sample table: employees


Sample Solution:

SELECT max(salary)
FROM employees;

Sample Output:

   max
---------
 6000.00
(1 row)

Relational Algebra Expression:

Relational Algebra Expression: Find the highest salary from all the employees.

Relational Algebra Tree:

Relational Algebra Tree: Find the highest salary from all the employees.

Practice Online


Sample Database: employee

employee database structure

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Previous: From the following table, write a SQL query to find those employees who work in the department 1001. Sort the result-set in ascending order by salary. Return employee ID, employee name, salary and department ID.
Next: From the following table, write a SQL query to find the average salary and average total remuneration (salary and commission) for each type of job. Return name, average salary and average total remuneration.

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SQL: Tips of the Day

Delete all Duplicate Rows except for One in MySQL?

SELECT * FROM names;

+----+--------+
| id | name   |
+----+--------+
| 1  | google |
| 2  | yahoo  |
| 3  | msn    |
| 4  | google |
| 5  | google |
| 6  | yahoo  |
+----+--------+

1. If you want to keep the row with the lowest id value:

DELETE n1 FROM names n1, names n2 WHERE n1.id > n2.id AND n1.name = n2.name

2. If you want to keep the row with the highest id value:

DELETE n1 FROM names n1, names n2 WHERE n1.id < n2.id AND n1.name = n2.name

Ref: https://bit.ly/3NroM8o