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Unique index problem

Unique index problem

Unique index problem

(OP)
I have a weird problem in dBase III+

DB structure:
Field  Field Name  Type       Width    Dec
    1  JNUMMER     Numeric        6
    2  BRIN        Character      4
    3  PLDATUM     Date           8
    4  LEERJAAR    Numeric        1
    5  TICK        Logical        1

(set date british
set century on
set deleted on)

. list all for jnummer=23
Record#  JNUMMER BRIN PLDATUM    LEERJAAR TICK
    738       23 20TQ 1986.12.08        8 .T.
  14213       23 17YS 1995.08.01        2 .T.
  19066       23 17YS 1998.08.01        0 .F.

. INDE ON STR(JNUMMER)+BRIN+DTOC(PLDATUM) TO BRINHIS UNIQUE
(or SET UNIQUE ON and then INDEX without the UNIQUE)

. list all for jnummer=23
Record#  JNUMMER BRIN PLDATUM    LEERJAAR TICK
  14213       23 17YS 1995.08.01        2 .T.
    738       23 20TQ 1986.12.08        8 .T.

This is wrong, the index includes the date, so all three records are unique. The 19066 record should be there.

Other symptoms:
I cannot BROWSE, I constantly get 'Record is not in index', whether I GO BOTTOM or GO TOP or SKIP first

What can be going on here?

Thanks in advance
Jan

 

RE: Unique index problem

(OP)
Problem resolved!

The error was in the STR(JNUMMER) in the index key - this makes variable length index keys and xBase can't handle that
(I even tried to do the above in Clipper code and got the same errors).
Changing it to STR(JNUMMER,10) solved the problem.

Somewhere deep in my memory I already knew this issue - it's been too long since I last used Clipper/dBase winky smile
 

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