SQL Queries:DATA Aggregation,JOINS (LEFT,RIGHT,INNER,CROSS & FULL OUTER JOIN)
create table exams(student_id integer,subjects varchar(20),marks int);
insert into exams values(1,'chemistry',91),(1,'physics',91),(1,'maths',92)
,(2,'chemistry',91),(2,'physics',91),(2,'maths',92)
,(3,'chemistry',9...
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