ORA-02449：unique/primary keys in table referenced by foreign keys
错误码
错误描述：unique/primary keys in table referenced by foreign keys
错误原因：An attempt was made to drop a table with unique or primary keys referenced by foreign keys in another table.
解决方法：Before performing the above operations the table, drop the foreign key constraints in other tables. You can see what constraints are referencing a table by issuing the following command: SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = "tabnam";
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