how to query multiple categories in wordpress?

Use like this

query_posts( array( 'category__in' => array(5,1), 'posts_per_page' => 1, 'orderby' => 'title', 'order' => 'ASC' ) );

or

$my_query = new WP_query(array('category__and' => array(5,1))); 
while ($my_query->have_posts()) : $my_query->the_post();

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