https://github.com/dalezhang/employee_test_case

https://github.com/dalezhang/employee_test_case

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• Host: GitHub
• URL: https://github.com/dalezhang/employee_test_case
• Owner: dalezhang
• Created: 2024-07-06T03:33:46.000Z (6 months ago)
• Default Branch: main
• Last Pushed: 2024-07-06T03:58:02.000Z (6 months ago)
• Last Synced: 2024-10-19T17:32:04.856Z (3 months ago)
• Language: JavaScript
• Size: 17.6 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
Test case 2: SQL

==================

You are given a table in postgres which is a list of employees with their salaries and departments. You need to write a query that will select the person with the maximum salary from each department (or several if the amounts are the same).

You can use dump of table [employee.sql](employee.sql) as a test data, sample schema:

```

postgres=# \d employee

            Table "public.employee"

   Column   |         Type          | Modifiers

------------+-----------------------+-----------

 id         | integer               | not null

 name       | character varying(30) |

 department | character varying(30) |

 salary     | integer               |

Indexes:

    "employee_pkey" PRIMARY KEY, btree (id)

```

## Solution:

```sql

SELECT e.department, e.salary, e.id

FROM employee e

JOIN (

    SELECT department, MAX(salary) as max_salary

    FROM employee

    GROUP BY department

) em ON e.department = em.department AND e.salary = em.max_salary ORDER BY e.department;

```