I want to avoid to have 2 different contructions of $selection...
Don't avoid it, don't worry about it. Just do it, e.g.:
my @filter;
push @filter, "tag1 like '$value1'" if $value1;
push @filter, "tag2 like '$value2'" if $value2;

$sql .= "WHERE " . join(" AND ", @filter) if @filter;

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In reply to Re: DBI SQLite statement problem with % by runrig
in thread DBI SQLite statement problem with % by Anonymous Monk

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