[Koha] Patron's barcode

[ils rehoboth]

Hi all,
I have been struggling to come up with an sql query that can generate patrons barcode from koha (i am using 3.0. ) using kbarcode.
I have come up with the following sql query but it seems it is not working. Can somebody correct my sql statement: 
SELECTborrowers.surname, borrowers.firstname,
borrowers.cardnumber as barcode FROM borrowers 
WHERE borrowers.cardnumber >=02300
and borrowers.cardnumber <=02310;  (NB: 02300 and 02310 represent the range of patrons' barcodes to be generated)


Your input is highly appreciated.


      
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