47 lines
2.2 KiB
SQL
47 lines
2.2 KiB
SQL
DROP TABLE IF EXISTS Salary CASCADE;
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CREATE TABLE Salary(
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id INT PRIMARY KEY,
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salary INT
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);
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DROP TABLE IF EXISTS Positions CASCADE;
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CREATE TABLE Positions(
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id INT PRIMARY KEY,
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title VARCHAR(255)
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);
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DROP TABLE IF EXISTS People;
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CREATE TABLE People(
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id INT PRIMARY KEY,
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name VARCHAR(255),
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position_id INT REFERENCES Positions(id),
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salary_id INT REFERENCES Salary(id)
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);
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INSERT INTO Salary VALUES (1, 10000), (2, 20000), (3, 3000);
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INSERT INTO Positions VALUES (1, 'Дизайнер'), (2, 'Редактор'), (3, 'Программист');
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INSERT INTO PEOPLE VALUES (1, 'Владмир', 1, 1), (2, 'Татьяна', 2, 2), (3, 'Александр', NULL, 2), (4, 'Борис', 2, NULL);
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SELECT People.id, People.name, Positions.id as pos_id, Positions.title FROM People JOIN Positions on People.position_id = Positions.id;
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SELECT People.id, People.name, Positions.id as pos_id, Positions.title FROM People RIGHT JOIN Positions on People.position_id = Positions.id;
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SELECT People.id, People.name, Positions.id as pos_id, Positions.title FROM People LEFT JOIN Positions on People.position_id = Positions.id
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EXCEPT
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SELECT People.id, People.name, Positions.id as pos_id, Positions.title FROM People JOIN Positions on People.position_id = Positions.id;
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SELECT People.id, People.name, Positions.id as pos_id, Positions.title FROM People LEFT JOIN Positions on People.position_id = Positions.id
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WHERE People.position_id ISNULL;
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SELECT People.id, People.name, Positions.id as pos_id, Positions.title FROM People FULL JOIN Positions on People.position_id = Positions.id
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WHERE Positions.id ISNULL OR People.id ISNULL;
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SELECT People.id, People.name, Positions.id as pos_id, Positions.title FROM People LEFT JOIN Positions on People.position_id = Positions.id
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UNION
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SELECT People.id, People.name, Positions.id as pos_id, Positions.title FROM People RIGHT JOIN Positions on People.position_id = Positions.id
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EXCEPT
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SELECT People.id, People.name, Positions.id as pos_id, Positions.title FROM People JOIN Positions on People.position_id = Positions.id;
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SELECT People.id, name, position_id, title, salary_id, salary FROM People
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JOIN Positions on People.position_id = Positions.id
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JOIN Salary ON People.salary_id = Salary.id; |