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Optimizing multi-table queries

Extending a plan

Schema


R(rk, ...)

S(sk1, sk2, 
  rk references R, ...)

T(tk, ...)

U(uk, 
  sk1, sk2, ...,
  tk references T,
  foreign key(sk1, sk2) references S)

V(vk, 
  sk1, sk2, ..., 
  foreign key(sk1, sk2) references S)

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