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SQLize.online is a free online SQL environment for quickly running, experimenting with and sharing code. You can run your SQL code on top of the most popular RDBMS including MySQL, MariaDB, SQLite, PostgreSQL, Oracle and Microsoft SQL Server.

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-- Hint: use Ctrl+Enter for SQL autocomplete CREATE TABLE currencies ( id CHAR(3) PRIMARY KEY, rate DECIMAL(12,6) ); INSERT INTO currencies VALUES ('RUB', 1), ('USD', 75.64), ('EUR', 91.67); CREATE TABLE clients ( id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255) ); INSERT INTO clients (name) VALUES ('CLient 1'), ('CLient 2'); CREATE TABLE deposits ( num INT PRIMARY KEY, client_id INT, balance DECIMAL(12,2), currency CHAR(3) ); INSERT INTO deposits VALUES (342344, 1, 100, 'RUB'), (342345, 1, 100, 'USD'), (342346, 2, 100, 'EUR'); SELECT * FROM clients JOIN deposits d ON d.client_id = clients.id JOIN currencies cur on d.currency = cur.id ; SELECT clients.name, SUM(balance*rate) as rub_balance FROM clients JOIN deposits d ON d.client_id = clients.id JOIN currencies cur on d.currency = cur.id GROUP BY clients.id, clients.name ; SELECT clients.name, SUM(balance * CASE d.currency WHEN 'USD' THEN 75.64 WHEN 'EUR' THEN 91.67 ELSE 1 END ) as rub_balance FROM clients JOIN deposits d ON d.client_id = clients.id GROUP BY clients.id, clients.name ;

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