Disabling a Constraint : Constraint « Table « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Table » Constraint   6. 10. 6. Disabling a Constraint By default, a constraint is enabled when you create it. You can disable a constraint when you create it by adding DISABLE to the end of the CONSTRAINT clause. SQL> -- create demo table SQL> create table myTable(   2    id           NUMBER(2),   3    value        NUMBER(6,2)   4  )   5  / Table created. SQL> SQL> SQL> ALTER TABLE myTable   2  ADD CONSTRAINT uq UNIQUE (id) DISABLE; Table altered. SQL> SQL> ALTER TABLE myTable   2  DISABLE CONSTRAINT uq; Table altered. SQL> SQL> drop table myTable   2  / Table dropped. SQL> 6. 10. Constraint 6. 10. 1.  Adding a Constraint 6. 10. 2.  Add constaint for a date type column: larger than a certain date 6. 10. 3.  Adding a 'NOT NULL' Constraint 6. 10. 4.  The database automatically assigns a name to the constraint 6. 10. 5.  Dropping a Constraint 6. 10. 6.  Disabling a Constraint 6. 10. 7.  Add CASCADE to the end of a DISABLE CONSTRAINT clause 6. 10. 8.  Enabling a Constraint 6. 10. 9.  You can also choose to apply a constraint to new data only by specifying ENABLE NOVALIDATE. 6. 10. 10.  Deferred Constraints 6. 10. 11.  How to drop a constaint 6. 10. 12.  Violate a constraint 6. 10. 13.  Cascade constraints

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