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N_XNUM()
Get the number of the specified field in current table

Syntax
N_XNUM(<cField>)

Argument
<cField> is the name of a field in the current table. The case of <cField> 
is ignored.

Returns
Ordinal number of the specified field in the current table. If the field is 
not found, then zero is returned.

Example
N_XUSE('patients.dta', ...)
? N_XNUM('ID')
1
? N_XNUM('First_Name')
2

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