SQL Exercise: Number of employee for each job in each department
SQL employee Database: Exercise-97 with Solution
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97. From the following table, write a SQL query to count the number of employees in each designation of a department. Return department id, job name and number of employees.
Sample table: employees
SELECT dep_id, job_name, count(*) FROM employees GROUP BY dep_id, job_name;
dep_id | job_name | count --------+-----------+------- 3001 | MANAGER | 1 2001 | ANALYST | 2 3001 | SALESMAN | 4 1001 | MANAGER | 1 1001 | PRESIDENT | 1 2001 | MANAGER | 1 2001 | CLERK | 2 1001 | CLERK | 1 3001 | CLERK | 1 (9 rows)
The given query in SQL that retrieves "dep_id" ,"job_name" and the count of employees in each department and job name, but only for those who were hired on or after January 1st, 2022 from the table 'employees'.
It groups the data by the combination of columns "dep_id" and "job_name", and counts the number of records for each combination.
Relational Algebra Expression:
Relational Algebra Tree:
Sample Database: employee
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Previous SQL Exercise: In ASC order, list managers and count their employees.
Next SQL Exercise: List the department where at least two employees work.
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