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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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CREATE TABLE Department ( id INT PRIMARY KEY, name VARCHAR(100) ); CREATE TABLE Employee ( id INT PRIMARY KEY, department_id INT, chief_id INT, name VARCHAR(100), salary INT, FOREIGN KEY(department_id) REFERENCES Department(id), FOREIGN KEY(chief_id) REFERENCES Employee(id) ); INSERT INTO Department(id, name) VALUES (1,'First'); INSERT INTO Department(id, name) VALUES (2,'Second'); INSERT INTO Employee(id, department_id, chief_id, name, salary) VALUES (4, 1, 4, '1 chef', 50); INSERT INTO Employee(id, department_id, chief_id, name, salary) VALUES (5, 2, 5, '2 chef', 60); INSERT INTO Employee(id, department_id, chief_id, name, salary) VALUES (1, 1, 4, '1 not', 50); INSERT INTO Employee(id, department_id, chief_id, name, salary) VALUES (2, 1, 4, '2 not', 60); INSERT INTO Employee(id, department_id, chief_id, name, salary) VALUES (3, 2, 5, '3 not', 45); INSERT INTO Employee(id, department_id, chief_id, name, salary) VALUES (6, 2, 5, '6 not', 65); SELECT * FROM Department; SELECT * FROM Employee; SELECT * FROM Employee WHERE id=chief_id; WITH sum_salary AS ( SELECT department_id, sum(salary) salary FROM Employee GROUP BY department_id) select department_id from sum_salary a where a.salary = ( select max(salary) from sum_salary )
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