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

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Oracle PL/SQL Tutorial » Table » Constraint

6. 10. 1. Adding a Constraint

Constraint	Constraint Type	Meaning
CHECK	C	Specifies a certain condition for a column, or group of columns.
NOT NULL	C	Not null column
PRIMARY KEY	P	primary key
FOREIGN KEY	R	foreign key
UNIQUE	U	unique
CHECK OPTION	V	Specifies that DML operations on a view must satisfy the subquery.
READ ONLY	O	Specifies that a view may only be read from.


SQL> CREATE TABLE pet (

  2  id NUMBER(38) CONSTRAINT pk_pet PRIMARY KEY NOT NULL

  3  );



Table created.



SQL>

SQL>

SQL>

SQL> drop table pet;



Table dropped.



SQL>

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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