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(-)a/installer/data/mysql/atomicupdate/bug20754.perl (-1 / +11 lines)
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$DBversion = 'XXX';  # will be replaced by the RM
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if( CheckVersion( $DBversion ) ) {
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    # From: https://stackoverflow.com/questions/3311903/remove-duplicate-rows-in-mysql
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    $dbh->do(q|
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DELETE a
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FROM virtualshelfshares as a, virtualshelfshares as b
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WHERE a.id < b.id AND a.borrowernumber IS NOT NULL AND a.borrowernumber=b.borrowernumber AND a.shelfnumber=b.shelfnumber
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    |);
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    SetVersion( $DBversion );
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    print "Upgrade to $DBversion done (Bug 20754: Remove double accepted list shares)\n";
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}

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