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Database Management: Tables - page 22 / 35

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1/23/2015  UT Dallas

POEC 6382 Applied GIS Software

22

Modifying Item(Variable) Definitions in a File

MODIFY is used to replace (change), insert and delete item definitions such as their name type or width BEFORE addition of data records to the template file.  Must have an empty template--item definitions have been defined but attribute data has not yet been added (or all data records have been PURGED).

    R = replace

I = insert

D = delete

L = list

ALTER is used to alter item definitions  such as their name, type, or width AFTER addition of data records to the file. Items must be empty to decrease column width or decimal precision.

REDEFINE allows you to access contiguous items or parts of items in an INFO file as if it were another item.  

Items are formatted based on the columns (space holders) they occupy.

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