The EXTEND statement lists information about the
DBMS columns in a descriptor. The word *GROUP* is displayed to indicate the existence
of a group.
You can specify EXTEND
as many times as you want while creating a descriptor; specify EXTEND
last in your PROC ACCESS code to seethe completed descriptor information.
Or, if you are creating multiple descriptors, specify EXTEND before
the next CREATE statement to list all the information about the descriptor
that you are creating.
The EXTEND statement
can take one of the following arguments:
ALL
lists all of the DBMS columns in the file, the positional equivalents, the SAS names,
the SAS informats,
the
database contents, the number of occurrences, and the DBMS
column types (Alpha or Zoned). When you are creating an access descriptor,
*NON-DISPLAY* appears next to the column description for any column that has been dropped. When
you are creating a view descriptor,
*SELECTED* appears next to the column description for columns that you have selected for the
view.
VIEW
lists all the DBMS columns that are selected for the view descriptor, along with their
positional equivalents, their SAS names and informats, the database contents, number
of occurrences, DBMS column types, any subsetting clauses, and the word *SELECTED*. Any DBMS columns that are dropped in the access descriptor are not displayed. The
VIEW argument is valid only for a view descriptor.
column-identifier
lists the specified DBMS column's SAS name, its positional equivalent, its SAS informat,
the database content, number of occurrences, DBMS column
type, and whether the column has been selected or dropped. If the column name contains
special characters or national characters, enclose the name in quotation marks.
The
column-identifier argument can be either the CA-Datacom/DB
field name, the positional equivalent from the LIST statement, which is the number that
represents the column's place in the descriptor, or a list of names or positions.
For example, to list
information about the fifth column in the descriptor, submit the following statement:
extend 5;
Or, to list information
about the fifth, sixth, and eighth columns in the descriptor, submit
the following statement:
extend 5 6 8;