I have a table:

```
Subscriptions (idsub, dstart, dend, #idk)

```

dstart is date when the subscription was bought (Data type: date)

I need to count how many subscriptions were bought each month this year (or preferably - chosen year).
I know It should probably be done with COUNT, however I just started learning SQL and I am struggling with the 'each month' part. 

I am using Postgresql

Thanks for help