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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 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