KEY
RECORD KEY clause
in the file control entry
ALTERNATE RECORD KEY clause
in the file control entry
RELATIVE KEY clause
in the file control entry
ASCENDING KEY and DESCENDING KEY phrases in:
OCCURS clause
Fixed-length tables
Variable-length tables
MERGE statement
SORT statement
KEY phrase in:
READ statement
START statement
INVALID KEY phrases in:
DELETE statement
READ statement
REWRITE statement
START statement
WRITE statement