Chapter 3 DBMS Reference Guide
| Variable name | Comment | 
|---|---|
| COLUMNS COLNLIST  | 
List of columns of Key. Ex: "A, B, C" | 
| ISPKEY | TRUE when Key is Primary key of Table | 
| PKEY | Constraint name of primary key | 
| AKEY | Constraint name of alternate key | 
| KEY | Constraint name of the key | 
| ISMULTICOLN | True if the key has more than one column | 
| CLUSTER | Cluster keyword | 
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