SELECT * FROM wp_posts
LEFT JOIN wp_term_relationships ON
(wp_posts.ID = wp_term_relationships.object_id)
LEFT JOIN wp_term_taxonomy ON
(wp_term_relationships.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id)
WHERE wp_posts.post_type = 'post'
AND wp_term_taxonomy.taxonomy = 'category'
AND wp_term_taxonomy.term_id = 48
ORDER BY post_date DESC