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--!syntax_pg
select * from (select 1 as x ) u right join (select 1 as y) v on u.x=v.y right join (select 1 as z) r on v.y=r.z;
select * from (select 1 as x ) u right join (select 2 as y) v on u.x=v.y right join (select 3 as z) r on v.y=r.z;
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