DESCRIBE - determine distance between two fields
Basic form
DESCRIBE DISTANCE BETWEEN f1 AND f2 INTO f3.
Effect
Determines the distance between the fields f1 and
f2 and places the result (in bytes) in f3 .
Example
Determine the distance between two components of the
demo table SBOOK in the flight reservation system:
-
TABLES SBOOK.
DATA DIST TYPE I.
DESCRIBE DISTANCE BETWEEN SBOOK-CARRID
AND SBOOK-BOOKID
INTO DIST.
Result: DIST contains the value 15 because exactly two fields,
SFLIGHT-CONNID (4 bytes) and SBOOK-FLDATE (8 bytes), lie
between the SBOOK components CARRID and BOOKID ;
also, SBOOK-CARRID is itself 3 bytes long. The sum of these
values gives the distance between the two components in bytes.
Index
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