Insertion of broker values to break ties

[wendy-aw]

Adding data to break ties for the question in broker db:

Which customer made the highest number of transactions in the same month as they signed up? Return the customer's id, name and number of transactions.

New output:

 sbcustid |   sbcustname   | num_transactions 
----------+----------------+------------------
 C012     | Olivia Johnson |                3

Old data with ties

 sbcustid |    sbcustname     | num_transactions 
----------+-------------------+------------------
 C012     | Olivia Johnson    |                2
 C013     | Ethan Davis       |                2
 C014     | Ava Wilson        |                2
 C015     | Emma Brown        |                1
 C016     | sophia martinez   |                1
 C017     | Jacob Taylor      |                1
 C018     | Michael Anderson  |                1
 C019     | Isabella Thompson |                1

[wongjingping]

Nice, thank you!