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7
FOREIGN KEY (id, t2_id) REFERENCES t2(t1_id, id) ON DELETE CASCADE) ENGINE=INNODB;
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8
select * from data_dictionary.indexes where TABLE_SCHEMA= "test";
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9
TABLE_SCHEMA TABLE_NAME INDEX_NAME IS_USED_IN_PRIMARY IS_UNIQUE IS_NULLABLE KEY_LENGTH INDEX_TYPE INDEX_COMMENT
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CREATE TABLE t1(a1 INT NOT NULL, a2 INT NOT NULL,
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PRIMARY KEY(a1, a2)) ENGINE=INNODB;