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X-Hacker.org- dBsee 4.6 - The Library - Norton Guide
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The Data not valid if parameter in the Options allows to verify the
data entered by the operator in the field. The expression set must return
a logical value, i.e. true (.T.) or false (.F.).
During insertion of the expression, the Alt-1 keys allow to paste
names of files, fields, and user defined functions from the Data
Dictionary. If positioned on the list of user functions, the Ins key
allows to add a new function on-the-fly.
Example:
The data entered in the Supplier Discount (SupDsct) fields must be
comprised between 5 and 15 percent. The expression entered will thus be:
(SupDsct<5 .OR. SupDsct>15)
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