oracle文档表约束的介绍

ALL_CONSTRAINTS

网址： http://docs.oracle.com/cd/B19306_01/server.102/b14237/statviews_1037.htm

ALL_CONSTRAINTS describes constraint definitions on tables accessible to the current user.

Related Views

• DBA_CONSTRAINTS describes all constraint definitions in the database.

• USER_CONSTRAINTS describes constraint definitions on tables in the current user's schema.

Column	Datatype	NULL	Description
OWNER	VARCHAR2(30)	NOT NULL	Owner of the constraint definition
CONSTRAINT_NAME	VARCHAR2(30)	NOT NULL	Name of the constraint definition
CONSTRAINT_TYPE	VARCHAR2(1)		Type of constraint definition: C (check constraint on a table) P (primary key) U (unique key) R (referential integrity) V (with check option, on a view) O (with read only, on a view)
TABLE_NAME	VARCHAR2(30)	NOT NULL	Name associated with the table (or view) with constraint definition
SEARCH_CONDITION	LONG		Text of search condition for a check constraint
R_OWNER	VARCHAR2(30)		Owner of table referred to in a referential constraint
R_CONSTRAINT_NAME	VARCHAR2(30)		Name of the unique constraint definition for referenced table
DELETE_RULE	VARCHAR2(9)		Delete rule for a referential constraint (CASCADE or NO ACTION)
STATUS	VARCHAR2(8)		Enforcement status of constraint (ENABLED or DISABLED)
DEFERRABLE	VARCHAR2(14)		Whether the constraint is deferrable
DEFERRED	VARCHAR2(9)		Whether the constraint was initially deferred
VALIDATED	VARCHAR2(13)		Whether all data obeys the constraint (VALIDATED or NOT VALIDATED)
GENERATED	VARCHAR2(14)		Whether the name of the constraint is user or system generated
BAD	VARCHAR2(3)		A YES value indicates that this constraint specifies a century in an ambiguous manner. To avoid errors resulting from this ambiguity, rewrite the constraint using the TO_DATE function with a four-digit year. See Also: the TO_DATE function in Oracle Database SQL Referenceand Oracle Database Application Developer's Guide - Fundamentals
RELY	VARCHAR2(4)		Whether an enabled constraint is enforced or unenforced. See Also: the constraints in Oracle Database SQL Reference
LAST_CHANGE	DATE		When the constraint was last enabled or disabled
INDEX_OWNER	VARCHAR2(30)		Name of the user owning the index
INDEX_NAME	VARCHAR2(30)		Name of the index (only shown for unique and primary-key constraints)
INVALID	VARCHAR2(7)		Whether the constraint is invalid
VIEW_RELATED	VARCHAR2(14)		Whether the constraint depends on a view