Description:
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Table is empty. I insert one record in table. In spite that table contain two equal records, although at output record is single. I used mysql 5.0.20.

P.S.: I'm from Russia, sorry for my english..

Reproduce code:
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mysql_connect('localhost', 'root', NULL);
mysql_select_db('localhost');

echo '  Before:<br/>';
$result = mysql_query('SELECT * FROM `documents`');
while($array = mysql_fetch_assoc($result))
	printf('%d.%d %s<br/>', $array['id'], $array['id_branch'], $array['name']);

// Table is empty
mysql_query("INSERT INTO `documents` (`id`,`id_branch`,`name`) VALUES (NULL, 1, 'Record2')");
echo '  After:<br/>';
$result = mysql_query('SELECT * FROM `documents`');
while($array = mysql_fetch_assoc($result))
	printf('%d.%d %s<br/>', $array['id'], $array['id_branch'], $array['name']);

Expected result:
----------------
  Before:
  After:
1.1 Record2