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20 lines
612 B
Text
20 lines
612 B
Text
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CREATE TABLE parent1 ( id INT PRIMARY KEY, KEY (id) ) ENGINE=InnoDB;
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CREATE TABLE parent2 ( id INT PRIMARY KEY, KEY (id) ) ENGINE=InnoDB;
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CREATE TABLE child (
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id INT PRIMARY KEY,
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parent1_id INT,
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parent2_id INT,
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FOREIGN KEY (parent1_id) REFERENCES parent1(id),
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FOREIGN KEY (parent1_id) REFERENCES parent2(id)
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) ENGINE=InnoDB;
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INSERT INTO parent1 VALUES (1);
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INSERT INTO parent2 VALUES (1);
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INSERT INTO child VALUES (1,1,1);
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INSERT INTO child VALUES (2,1,1);
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SET foreign_key_checks=OFF;
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DROP TABLE parent1;
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UPDATE child SET parent1_id=2 WHERE id=1;
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DROP TABLE child;
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DROP TABLE parent2;
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SET foreign_key_checks=ON;
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