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my $sort_by = ($sort eq 'date') ? 'date_of' : 'user_name';

my $stmt = 'SELECT * FROM time_sheet WHERE user_id = ? ORDER BY '.$sor
+t_by; 
my $user_time = $dbh->selectall_arrayref($stmt, {Slice => {}}, $user_i
+d);

my $stmt;
if ($sort eq 'date') {
...

my $user_time = $dbh->selectall_arrayref($stmt, {Slice => {}}, $user_i
+d);