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CREATE TABLE bug48024(a int PRIMARY KEY,b int NOT NULL,KEY(b)) ENGINE=InnoDB;
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CREATE TABLE bug48024_b(b int PRIMARY KEY) ENGINE=InnoDB;
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ALTER TABLE bug48024 /*/ADD CONSTRAINT FOREIGN KEY(c) REFERENCES(a),/*/
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ADD CONSTRAINT FOREIGN KEY(b) REFERENCES bug48024_b(b);
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DROP TABLE bug48024,bug48024_b;
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CREATE TABLE bug48024(a int PRIMARY KEY,b int NOT NULL,KEY(b)) ENGINE=InnoDB;
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CREATE TABLE bug48024_b(b int PRIMARY KEY) ENGINE=InnoDB;
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ALTER TABLE bug48024 /*/ADD CONSTRAINT FOREIGN KEY(c) REFERENCES(a),/*/
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ADD CONSTRAINT FOREIGN KEY(b) REFERENCES bug48024_b(b)|
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DROP TABLE bug48024,bug48024_b;