Using PHP and MySQL, I have a table that holds check in data for customers: the month and year they checked in.

```
ID  Month   Year

1   01      2015
1   01      2015
4   01      2015
1   03      2015
4   03      2015
1   05      2015

```

I need a total count of rows per month and year. So in this example I should get a total of 3 for id 1 for the month of 01 and year 2015. I'm adding the total days a person checked in for each month of each year. 

Having a problem getting started with the code. I assume I can do this with MySQL `count` or something.