Sql query returns 0 rows

Question

SELECT * FROM class c 
Left join sub_inclass s on s.class_id=c.class_id 
join subject sb on  s.sub_id=sb.sub_id

The other two except class 'table' are empty, I have left join but class table is still not displaying

Answer 1

If you use only join it is an inner join by default.

SELECT * FROM class c 
Left join sub_inclass s on s.class_id=c.class_id 
left join subject sb on  s.sub_id=sb.sub_id
 ^-------------------you missed left here