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  1. or download this
    my $sql = <<EOSQL;

...
WHERE   data IN (?)

EOSQL
  2. or download this
    my $sql = <<EOSQL;

...
WHERE   data IN (@{[join ',', ('?') x $size]})

EOSQL
  3. or download this
    my $sql = do {
    my @holders = ('?') x $size;
...

EOSQL
};
  4. or download this
    my $sql = sprintf <<EOSQL, join ',', ('?') x $size;

...
WHERE   data IN (%s)

EOSQL