SELECT * FROM  menu_links  WHERE link_title = 0;
SELECT * FROM  menu_links  WHERE link_title = 0 AND link_path = 0;
SELECT * FROM  menu_links  WHERE link_title = 0 AND link_path = 0;
SELECT * FROM  menu_links  WHERE link_title = 0 AND link_path = 0;
SELECT menu_name FROM  menu_links  WHERE menu_name = 0 ;
SELECT * FROM  menu_links  WHERE link_title = 0;
SELECT * FROM  menu_links  WHERE mlid = 0;
SELECT mlid FROM  menu_links  WHERE module = 'system' AND router_path = 'user/logout';
SELECT * FROM  menu_custom ;
SELECT * FROM  menu_custom  ORDER BY title;
SELECT COUNT(*) FROM  menu_links  WHERE menu_name = 0;
SELECT mlid FROM  menu_links  ml WHERE ml.link_path = 0;
SELECT 1 FROM  menu_custom  WHERE menu_name = 0;
SELECT 1 FROM  menu_links  WHERE menu_name = 0;
SELECT mlid FROM  menu_links  WHERE link_path = 0 AND module = 0;
SELECT mlid FROM  menu_links  WHERE link_path = 0;
SELECT mlid AS plid, menu_name FROM  menu_links  WHERE link_path = 'admin/structure/menu' AND module = 'system';
SELECT * FROM  menu_custom ;
SELECT mlid FROM  menu_links  WHERE link_path = 0 AND plid = 0;
SELECT * FROM  menu_custom ;
SELECT mlid FROM  menu_links  WHERE link_path = 0 AND module = 'menu';
SELECT mlid FROM  menu_links  WHERE link_path = 0 AND menu_name = 0  AND module = 'menu' ORDER BY mlid ASC;
SELECT mlid FROM  menu_links  WHERE link_path = 0 AND module = 'menu' AND menu_name IN (0 ) ORDER BY mlid ASC;