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STR ���������������������������Clipper���������
2015-01-15 00:26:14.0
���HXTT DBF driver���������������STR(123) = STR (123,10)
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Re:STR ���������������������������Clipper���������
HXTT Support
2015-01-15 07:50:38.0
In dbase/Foxpro
If nLength is omitted, nLength defaults to 10 characters.

In Clipper:
Results of STR() with No Optional Arguments
Expression Return Value Length
Field Variable Field length plus decimals
Expressions/constants Minimum of 10 digits plus decimals
VAL() Minimum of 3 digits
MONTH()/DAY() 3 digits
YEAR() 5 digits
RECNO() 7 digits
So the best solution is using
STR(nNumber, nLength) as index expression.

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