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Depending on the version of Drupal :

drupal 6:

$nodes = db_query('SELECT nid FROM {node} WHERE type="%s"', $type);

drupal 7:

$nodes = node_load_multiple(array(), array('type' => $type));

drupal 8:

$nids = \Drupal::entityQuery('node')
  ->condition('type', 'NODETYPE')
  ->execute();
$nodes = \Drupal::entityTypeManager()
  ->getStorage('node')
  ->loadMultiple($nids);

The code to use depends from the Drupal version.

Drupal 6

$nodes = db_query('SELECT nid FROM {node} WHERE type="%s"', $type);

Drupal 7

$nodes = node_load_multiple(array(), array('type' => $type));

Drupal 8

$nids = \Drupal::entityQuery('node')
  ->condition('type', 'NODETYPE')
  ->execute();
$nodes = \Drupal::entityTypeManager()
  ->getStorage('node')
  ->loadMultiple($nids);

Depending on the version of Drupal :

drupal 6:

$nodes = db_query('SELECT nid FROM {node} WHERE type="%s"', $type);

drupal 7:

$nodes = node_load_multiple(array(), array('type' => $type));

drupal 8:

$nids = \Drupal::entityQuery('node')
  ->condition('type', 'student_vote')
  ->execute();
$nodes = \Drupal::entityTypeManager()
  ->getStorage('node')
  ->loadMultiple($nids);

Depending on the version of Drupal :

drupal 6:

$nodes = db_query('SELECT nid FROM {node} WHERE type="%s"', $type);

drupal 7:

$nodes = node_load_multiple(array(), array('type' => $type));

drupal 8:

$nids = \Drupal::entityQuery('node')
  ->condition('type', 'NODETYPE')
  ->execute();
$nodes = \Drupal::entityTypeManager()
  ->getStorage('node')
  ->loadMultiple($nids);

What version of drupal?
drupal 6: $nodes = db_query('SELECT nid FROM {node} WHERE type="%s"', $type);
drupal 7: $nodes = node_load_multiple(array(), array('type' => $type));
 

Depending on the version of Drupal :

drupal 6:

$nodes = db_query('SELECT nid FROM {node} WHERE type="%s"', $type);

drupal 7:

$nodes = node_load_multiple(array(), array('type' => $type));

drupal 8:

$nids = \Drupal::entityQuery('node')
  ->condition('type', 'student_vote')
  ->execute();
$nodes = \Drupal::entityTypeManager()
  ->getStorage('node')
  ->loadMultiple($nids);