1. Query which tables have added foreign key dependencies
SELECT C.TABLE_SCHEMA owner,
C.REFERENCED_TABLE_NAME parent table name,
C.REFERENCED_COLUMN_NAME parent table field,
C.TABLE_NAME child table name,
C.COLUMN_NAME subtable field,
C.CONSTRAINT_NAME constraint name,
T.TABLE_COMMENT table comment,
R.UPDATE_RULE constraint update rule,
R.DELETE_RULE constraint deletion rule
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE C
JOIN INFORMATION_SCHEMA. TABLES T
ON T.TABLE_NAME = C.TABLE_NAME
JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS R
ON R.TABLE_NAME = C.TABLE_NAME
AND R.CONSTRAINT_NAME = C.CONSTRAINT_NAME
AND R.REFERENCED_TABLE_NAME = C.REFERENCED_TABLE_NAME
WHERE C.REFERENCED_TABLE_NAME IS NOT NULL
and C.TABLE_SCHEMA = 'database name'
and C.REFERENCED_TABLE_NAME = 'Dependent table name';
2. Delete the foreign key
ALTER TABLE ${table name} DROP FOREIGN KEY ${foreign key name};
1) Delete one by one, the foreign key name may be different
2) If there are many, it is recommended to write a main method in java to generate sql