Multiple counts (over 2000 rows by 2000 columns) - sql

Question

I apologize if I can't explain myself clearly but I'll try my best.
So I need to query a table (money transactions) where in a certain, say branch R1 sends money to another branch (can be any branch (R1 - R2000)). I need to be able to get the count of transactions (money sent). The problem is that there are too many branches (2000+ branches).
The table looks like this:
This is how the results should look like this:
I did the same query with this before but there were only less than 20 branches that were considered. I did something like this.
SELECT
SUM(CASE WHEN BranchCode = 'R1' THEN 1 ELSE 0 END) 'R1',
SUM(CASE WHEN BranchCode = 'R2' THEN 1 ELSE 0 END) 'R2',
.....
SUM(CASE WHEN BranchCode = 'R20' THEN 1 ELSE 0 END) 'R20'
FROM MoneyTable
I want to know if I can be able to do this in a more efficient way.

Answer 1

It's hard to say without more information, such as what your table looks like, but assuming that each for each row, the value in column BranchCode indicates that a particular branch sent money, and you just want to count the number of transactions that the branch sent to any other branch the query would look something like this.
select sending_branch, count(*)
from moneytable
group by 1
Assuming you wanted transaction counts from one branch to another, then something like this.
select sending_branch, receiving_branch, count(*)
from moneytable
group by 1,2
Similarly if you wanted amounts
select sending_branch, receiving_branch, sum(amount)
from moneytable
group by 1,2