SQL exercises on employee Database: List the name of departments where atleast 2 employees are working in that department
SQL employee Database: Exercise-102 with Solution
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102. From the following tables, write a SQL query to find those departments where at least two employees work. Return department name, number of employees.
Sample table: employees
Sample table: department
Sample Solution:
SELECT d.dep_name,
count(*)
FROM employees e,
department d
WHERE e.dep_id = d.dep_id
GROUP BY d.dep_name
HAVING count(*) >= 2;
Sample Output:
dep_name | count -----------+------- FINANCE | 3 MARKETING | 6 AUDIT | 5 (3 rows)s
Relational Algebra Expression:

Relational Algebra Tree:

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Sample Database: employee

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Previous: From the following table, write a SQL query to find those departments where less than four employees work. Return department ID, number of employees.
Next: From the following table, write a SQL query to check whether the employees ID are unique or not. Return employee id, number of employees.
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SQL: Tips of the Day
How to restore a dump file from mysqldump?
It should be as simple as running this:
mysql -u <user> -p < db_backup.dump
If the dump is of a single database you may have to add a line at the top of the file:
USE <database-name-here>;
Ref: https://bit.ly/3xKmyw2
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