simple join , sub queries, inner join

4. This will produce same result ::
SELECT tutorials_tbl.tutorial_id ,
tutorials_tbl.tutorial_author ,
tcount_tbl.tutorial_count
FROM tutorials_tbl, tcount_tbl
WHERE tutorials_tbl.tutorial_author =
tcount_tbl. tutorial_author;

7. SELECT book_mast.book_id,
book_mast.book_name,
category.cate_descrip
FROM book_mast INNER JOIN category
ON book_mast.cate_id = category.cate_id ;

8. SELECT book_id, book_name, cate_descrip
FROM book_mast INNER JOIN category
USING(cate_id);