comparision between usage is index and table with subscript

muthukumarapandian · Posted: Fri Feb 25, 2005 7:56 pm

Hi,
Any one can tell me the comparision between usage is index and table with subscript as indexed item.

priya · Posted: Sun Feb 27, 2005 1:54 am

Hi,

Usage is Index and INDEXED BY variables both are same.

sinusam · New User Joined: 06 Jan 2004 Posts: 18

Hi,
They are actually different.

A Variable defined with
USAGE IS INDEX - is called as INDEX DATA ITEM

A variable declared with
INDEXED BY - is called as INDEX NAME

The Index data item is a 4 byte elementary item (not necessarily connected with any table) that can be used to save INDEX NAME values for future reference.

A SET statement can be used to set the INDEX VALUE to an INDEX DATA ITEM.

INDEX NAMES are always associated with its Table.

While coding them please check the manuals for the rules of Comparing INDEX VALUEs and INDEX DATA ITEMs, and also movement of data between the two.

So, please be in alert when using INDEX VALUEs and INDEX DATA ITEMs.

Regards,
Sinu Sam

muthukumarapandian · Posted: Tue Mar 01, 2005 9:31 am

Hi,

Then what is the use of that usage in index.

narena · New User Joined: 16 Mar 2005 Posts: 18

Hi,

If we declare a var with Usage Index, it will be used to store the value of the Indexed Variable. We define an array with indexed by clause & a var, which is called indexed variable.

The value of this indexed variable cannt be stored in Ordinary Variable. So we define a Var with Usage Index.