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select a.x,
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from  a,
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where  a.x=b.x(+)
and    a.y=b.y(+)
and    a.z=c.z(+)
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select d.x,
      d.y,
      c.z
from  (a right join b on a.x=b.x and a.y=b.y) d right join c on d.z=c.z

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select a.x,b.y,c.z from a
right join b on a.x=b.x and a.y=b.y
right join c on a.z=c.z

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