Dear Darshan,
I will suggest you to do it in excel, where you can use pivot table to count how many opportunity do you have per period instead of using SAPB1 query.
But if you really want it, then you can use count(T0.[OpprId]) in the first column, but then you have to group all fields in your query.
In my opinion, using excel is better than using SAP query because it's more informative and easy to read but it's up to you 
.
Best Regards,
Lailus