CREATE TABLE Financial_Transactions (transaction_id NUMBER, previous_transaction_id NUMBER, account_id NUMBER, card_id NUMBER, transaction_type VARCHAR2, transaction_date DATETIME, transaction_amount DOUBLE PRECISION, transaction_comment VARCHAR2, other_transaction_details VARCHAR2)
CREATE TABLE Accounts (account_id NUMBER, customer_id NUMBER, account_name VARCHAR2, other_account_details VARCHAR2)
CREATE TABLE Customers (customer_id NUMBER, customer_first_name VARCHAR2, customer_last_name VARCHAR2, customer_address VARCHAR2, customer_phone VARCHAR2, customer_email VARCHAR2, other_customer_details VARCHAR2)
CREATE TABLE Customers_Cards (card_id NUMBER, customer_id NUMBER, card_type_code VARCHAR2, card_number VARCHAR2, date_valid_from DATETIME, date_valid_to DATETIME, other_card_details VARCHAR2)

Give me a bar chart showing the number of customers who has an account for each customer last name, and sort from high to low by the y axis please.
SELECT customer_last_name, COUNT(customer_last_name) FROM Customers AS T1 JOIN Accounts AS T2 ON T1.customer_id = T2.customer_id GROUP BY customer_last_name ORDER BY COUNT(customer_last_name) DESC
SELECT "customer_last_name", COUNT("customer_last_name") FROM "Customers" "T1" JOIN "Accounts" "T2" ON "T1"."customer_id" = "T2"."customer_id" GROUP BY "customer_last_name" ORDER BY COUNT("customer_last_name") DESC