I have model having fields as name, school, email, address etc.

I want to find out the rows for which there is same entry for `name` and `school` field ?

```
eg:
name school email 
abc     mps    abc@gmail.com
abc     mps    abc@gmail.com
xyz     vps    xyz@gmail.com
abc     mps    abc@gmail.com
poi     vps    poi@gmail.com
jkl     vps    jkl@gmail.com

```

like for `name` abc and `school` mps ther are 3 entries and for xyz and vps there are 2 entries 
I can nested `for` loop and iterative manner to check the name and school fields against all the rows in the table. That would be performance hit (n\*n)

Is there any other way to find out ?