This advanced SQL exercise is part of the book: Advanced SQL – Practical Techniques and Use-Cases, which includes 100 day-to-day SQL challenges (and solutions), need-to-know advanced features, and key concepts.
Given a table that specifies transactions in the bank account of various clients. Each row specifies the transaction date, client number, client name, transaction type (D indicates Deposit and W indicates Withdraw), and the transaction’s sum.
CREATE TABLE account_actions (a_date date, c_id int, c_name varchar(25), c_action varchar(1), c_amount int) GO