REFERENCES Column Constraint
Column constraint to create a relationship to an index key of another table
REFERENCES <cTableName> TAG <cTagName>
ALTER TABLE, CONSTRAINTS, CREATE TABLE
A constraint is used to define rules that help to provide data integrity. Column constraints are specific to the column name specified. You must have ALTER privilege on the table. The table will be locked for EXCLUSIVE use during the operation.
The REFERENCES column constraint is used to create a relationship to an index key of another table. The value of a column which has the REFERENCES column constraint set is validated by checking that it already exists as a value in the referenced index key.
The name of the referenced table is specified in <cTableName>. The index tag to reference is specified in <cTagName>.
CREATE TABLE supplier; (SuppId i PRIMARY KEY,; SuppName c(40) UNIQUE) CREATE TABLE purchase_order; (POid i PRIMARY KEY,; SuppId i REFERENCES supplier TAG SuppId,; POtotal n(10,2))
Lianja, Lianja Server