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

Give me a bar chart showing the number of customers who has an account for each customer last name.
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
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"