SQL exercises on employee Database: Display the average salaries of all the employees who works as ANALYST

Last update on May 30 2022 07:27:29 (UTC/GMT +8 hours)

SQL employee Database: Exercise-13 with Solution

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13. From the following table, write a SQL query to compute the average salary of those employees who work as ‘ANALYST’. Return average salary.

Sample table: employees

Pictorial Presentation:

SQL exercises on employee Database: Display the average salaries of all the employees who works as ANALYST.

Sample Solution:

SELECT avg(salary)
FROM employees
WHERE job_name = 'ANALYST';

Sample Output:

          avg
-----------------------
 3100.0000000000000000
(1 row)

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Sample Database: employee

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Previous: From the following table, write a SQL query to find those employees who joined before 1991. Return complete information about the employees.
Next: From the following table, write a SQL query to find the details of the employee ‘BLAZE’.

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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