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34 lines
758 B
Text
34 lines
758 B
Text
CREATE TABLE parent (
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id INT NOT NULL,
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PRIMARY KEY (id)
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) ENGINE=InnoDB;
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CREATE TABLE child (
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id INT,
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parent_id INT,
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FOREIGN KEY (parent_id)
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REFERENCES parent(id)
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ON UPDATE SET NULL
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ON DELETE SET NULL
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) ENGINE=InnoDB;
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INSERT INTO parent VALUES (1),(2);
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INSERT INTO child VALUES (1,1),(2,2);
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connection node_2;
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DELETE FROM parent WHERE id = 1;
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SELECT parent_id IS NULL FROM child WHERE id = 1;
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parent_id IS NULL
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1
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connection node_1;
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SELECT parent_id IS NULL FROM child WHERE id = 1;
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parent_id IS NULL
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1
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UPDATE parent SET id = 3 WHERE id = 2;
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SELECT parent_id IS NULL FROM child WHERE id = 2;
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parent_id IS NULL
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1
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connection node_2;
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SELECT parent_id IS NULL FROM child WHERE id = 2;
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parent_id IS NULL
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1
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connection node_1;
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DROP TABLE child;
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DROP TABLE parent;
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