Median Employee Salary

Table: employee

The employee table has three columns: Employee Id, Company Name, and Salary.

+-----+------------+--------+
|Id   | Company    | Salary |
+-----+------------+--------+
|1     | A           | 2341   |
|2     | A           | 341    |
|3     | A           | 15     |
|4     | A           | 15314  |
|5     | A           | 451    |
|6     | A           | 513    |
|7     | B           | 15     |
|8     | B           | 13     |
|9     | B           | 1154   |
|10   | B          | 1345   |
|11   | B          | 1221   |
|12   | B          | 234    |
|13   | C          | 2345   |
|14   | C          | 2645   |
|15   | C          | 2645   |
|16   | C          | 2652   |
|17   | C          | 65     |
+-----+------------+--------+

Write a SQL query to find the median salary of each company. Bonus points if you can solve it without using any built-in SQL functions.

+-----+------------+--------+
|Id   | Company    | Salary |
+-----+------------+--------+
|5      | A          | 451    |
|6      | A          | 513    |
|12    | B          | 234    |
|9      | B          | 1154   |
|14    | C          | 2645   |
+-----+------------+--------+