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

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
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