Quản lý contrains trong Oracle Database

--Check

Dba_contraint

--Add contraint

ALTER TABLE table1 ADD CONSTRAINT table1_ctr  PRIMARY KEY (transaction_date,merchant_transaction_id) deferrable initially deferred NOVALIDATE;

ALTER TABLE user1.table1  MODIFY (emp_type varchar2(1 Byte) CONSTRAINT emp_type NOT NULL); 

ALTER TABLE user1.table1  MODIFY (emp_id NUMBER(19) CONSTRAINT emp_id NOT NULL); 

--Drop contrain

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