SYSTEM.CONSTRAINTCOL contains information about the columns used in
PRIMARY KEY, UNIQUE, and FOREIGN KEY integrity constraints.
Initially, the table is empty since the system catalog does not use
integrity constraints. ALLBASE/SQL updates this table when processing a
CREATE TABLE, DROP TABLE, or TRANSFER OWNERSHIP statement involving an
integrity constraint.
This table is accessed whenever an INSERT, type II INSERT, UPDATE, or
DELETE is performed on a table in the CONSTRAINT table to determine if the
constraint needs to be enforced. It is accessed whenever a REVOKE,
REMOVE FROM GROUP, or DROP GROUP statement is performed to determine
whether the constraint columns depend on the current authorization scheme.
Table 8-9 System.ConstraintCol
| Column Name | Type | Length | Description |
|---|
| CONSTRAINTNAME | CHAR | 20 | Name of the constraint containing this column |
| OWNER | CHAR | 20 | Owner of the constraint |
| COLUMNNAME | CHAR | 20 | Name of a column used in the constraint |
| POSITION | INTEGER | 4 | Position of the occurrence of the column in the constraint,
numbered 1, 2, ... n, where n is the value of NUMC in the
SYSTEM.CONSTRAINT tuple for this constraint.
|
EXAMPLE |
 |
SELECT * FROM System.ConstraintCol;
--------------------+--------------------+--------------------+-----------
CONSTRAINTNAME |OWNER |COLUMNNAME |POSITION
--------------------+--------------------+--------------------+-----------
SQLCON_00000001P00 |PURCHDB |PARTNUM | 1
CLUBS_PK |RECDB |CLUBNAME | 1
MEMBERS_PK |RECDB |MEMBERNAME | 1
MEMBERS_PK |RECDB |CLUB | 2
MEMBERS_FK |RECDB |CLUB | 1
EVENTS_FK |RECDB |COORDINATOR | 1
EVENTS_FK |RECDB |SPONSORCLUB | 2
---------------------------------------------------------------------------
Number of rows selected is 7
U[p], d[own], l[eft], r[ight], t[op], b[ottom], pr[int] <n>, or e[nd]> r
|
