﻿ SQL exercises on employee Database: Display the average salaries of all the employees who works as ANALYST - w3resource

# 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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## SQL: Tips of the Day

Delete all Duplicate Rows except for One in MySQL?

```SELECT * FROM names;

+----+--------+
| id | name   |
+----+--------+
| 2  | yahoo  |
| 3  | msn    |
| 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