Group Employees by Joined Day Name

Question

Find employees who joined on the same day of the week.

Accepted Answer

```sql
SELECT 
    DAYNAME(joined_at) AS day_of_week, 
    GROUP_CONCAT(name) AS employees
FROM employees
GROUP BY DAYNAME(joined_at)
HAVING COUNT(*) > 1;
```

This query groups employees by the name of the day they joined and returns the day name along with a comma-separated list of employee names for all days where more than one employee was hired.