Questão 1398826

select * from A left join B on A.key = B.key where B.key is null

select * from A right join B on A.key = B.key where A.key is null

select * from A inner join B on A.key = B.key where B

select * from A full outer join B on A.key = B.key where A.key is null or B.key is null

select * from A full outer join B on A.key = B.key