WP_Query

wp_query.php

<?php 

// http://codex.wordpress.org/Class_Reference/WP_Query

$query = new WP_Query( 'p=7' );
$query = new WP_Query( 'name=about-my-life' );

$query = new WP_Query( 'page_id=7' );
$query = new WP_Query( 'pagename=contact' );

$query = new WP_Query( array( 'post_type' => 'page', 'post__in' => array( 2, 5, 12, 14, 20 ) ) );


// The Query
$the_query = new WP_Query( $args );

// The Loop
while ( $the_query->have_posts() ) :
  $the_query->the_post();
  echo '<li>' . get_the_title() . '</li>';
endwhile;

/* Restore original Post Data 
 * NB: Because we are using new WP_Query we aren't stomping on the 
 * original $wp_query and it does not need to be reset.
*/
wp_reset_postdata();


/* The 2nd Query (without global var) */
$query2 = new WP_Query( $args2 );

// The 2nd Loop
while( $query2->have_posts() ):
  $query2->next_post();
	echo '<li>' . get_the_title( $query2->post->ID ) . '</li>';
endwhile;

// Restore original Post Data
wp_reset_postdata();

?>