This mysql query help to get data from the wp_posts table of the wordpress.It will get any data from the wp_post table.Only you have to set the condition in the WHERE clause of this query.
SELECT post_title,guid,post_content FROM wp_posts LEFT JOIN wp_postmeta ON wp_posts.ID = wp_postmeta.post_id 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_term_taxonomy.taxonomy = 'category' AND wp_term_taxonomy.term_id IN(1) AND (post_title LIKE '%$search%' OR post_content LIKE '%$search%' OR post_name LIKE '%$search%')