43 lines
1.1 KiB
SQL
43 lines
1.1 KiB
SQL
-- Display the name of the current database.
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SELECT CURRENT_DATABASE();
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-- Create tables starting with entities that do not depend on foreign keys.
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CREATE TABLE enclosures (
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id INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
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name VARCHAR(255) NOT NULL,
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area INTEGER,
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biome VARCHAR(20)
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);
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-- Delete a table.
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DROP TABLE enclosures;
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CREATE TABLE keepers (
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id INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
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name VARCHAR NOT NULL,
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salary NUMERIC(10, 3)
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);
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CREATE TABLE animals (
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id INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
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enclosure_id INT,
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name VARCHAR NOT NULL,
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is_healthy BOOLEAN DEFAULT TRUE,
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adoption_date DATE,
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note TEXT,
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FOREIGN KEY (enclosure_id) REFERENCES enclosures (id)
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);
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-- Junction table for the many-to-many relationship.
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CREATE TABLE animals_keepers (
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animal_id INT NOT NULL,
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keeper_id INT NOT NULL,
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PRIMARY KEY (animal_id, keeper_id),
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FOREIGN KEY (animal_id) REFERENCES animals (id),
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FOREIGN KEY (keeper_id) REFERENCES keepers (id)
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);
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-- Change an existing table structure with ALTER TABLE.
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