Any thoughts on why the following doesn't work. 
The Table is called Incomes, it has 3 cols called, name, dept and salary. I want to get the name and salary of personnel in the marketing dept whose salary is less than the average salary of all employees. 
When I run the following I get ERROR 1111. 

```
SELECT name, salary
FROM income
WHERE dept = "marketing"
HAVING salary < AVG(salary)

```