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  1. or download this
    SELECT column1,column2,column3 FROM table WHERE column4=?";
  2. or download this
     
SELECT ? FROM ? WHERE ?=?
  3. or download this
    my $query = "SELECT column1,column2,column3 FROM table WHERE column4=?
+";
my $sth = $dbh->prepare($query);
...

# if its easier for you, you can dereference that hash_ref:
my %hash = %$hash_ref;