Why does SELECT only return small table data?

Question

PHP

Friends, good evening :).
Explain, prompt. How so.

I fulfill request SELECT to 1 table - all deduces.
At performance of the same request to another - it is empty.
table1 has 7 columns 2 rows
table2 has 17 columns and over 300 rows, but doesn't output even 1 (when LIMIT is 1 or WHERE `id`='1').

Connection:

$dsn = "mysql:host=$servername;dbname=$database;charset=$charset";
  $options = array(
      PDO::ATTR_ERRMODE				=> PDO::ERRMODE_EXCEPTION,
      PDO::ATTR_ORACLE_NULLS		=> PDO::NULL_EMPTY_STRING,
      PDO::ATTR_DEFAULT_FETCH_MODE	=> PDO::FETCH_ASSOC
  );
  $pdo = new PDO($dsn, $username, $password, $options);

Query to table1:
$sql = $pdo->query("SELECT * FROM `table1`");
Output: as it should, associative array.

The query in Table 2 is the same, it
$sql = $pdo->query("SELECT * FROM `table2`");

outputs
array(0) { }

Answer 1

if the query returns empty, then there is no data in the table.
if you see this data in another program, then this program is connecting to another server