After making a credit card withdrawal, how many account/s with monthly issuance has a negative balance?
Negative balance means balance < 0; Operation = 'VYBER KARTOU' stands for credit card withdraw. Frequency = 'POPLATEK MESICNE' stands for monthly issurance
SELECT COUNT(T1.account_id) FROM trans AS T1 INNER JOIN account AS T2 ON T1.account_id = T2.account_id WHERE T1.balance < 0 AND T1.operation = 'VYBER KARTOU' AND T2.frequency = 'POPLATEK MESICNE'