The CHANGE RELATION statement with the CHANGE option modifies the
local attributes of an existing field. Only the attributes you
specify in the statement change; all others stay as they are.
For more details, see the Arguments.
You can change relation-specific constraints using the DELETE
CONSTRAINT clause of the CHANGE option. Any constraint to be
changed must be first specifically deleted by name and then re-
declared.
(B)0[mchange-clause =
qwqqqqqqqqq>qqqqqqqqwqqqqk
mqq> /* text */ qqqj x
lqqqqqqqqqq<qqqqqqqqqqqqqj
mwqq> global-field-name qqqqqqqqqqqqqqqqqqq>qqqqqqqqqqqqqqqqqqwqk
tqq> local-field-name qqqqqqqqqqqqqqqqqqqq>qqqqqqqqqqqqqqqqqqu x
mqq> local-field-name qqqqq> [4mBASED[m ON global-field-name qqqqqj x
lqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq<qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqj
mwqqqqqq>qqqqqqqqqwqwqwqqqqqqqqqqqqqqqqqqqq>qqqqqqqqqqqqqqqqqqqqqqwqwq>
mw> dtr-clause qwj x tq> [4mDELETE[m [4mCONSTRAINT[m qw> constraint-name qwu x
mqqqqq<qqqqqqqqj x x mqqqqqqqqq , qqqqqqqjx x
x mq> field-constraint-def qqqqqqqqqqqqqqqqqqqj x
mqqqqqqqqqqqqqqqqqqqqqqqq<qqqqqqqqqqqqqqqqqqqqqqj
1 – Arguments
The action of the CHANGE RELATION statement with the CHANGE
option depends on the change-clause as follows:
o CHANGE field-name BASED ON global-field-name-gives the
specified field the attributes of another field
o CHANGE field-name dtr-clause-changes DATATRIEVE support
characteristics
o DELETE CONSTRAINT constraint-name-deletes a relation-specific
constraint from the relation definition
You can specify local DATATRIEVE support clauses on any of these
fields. For more information on the DATATRIEVE clauses, ask for
HELP on Field_attr.