Imagine i have a table A with primary key "p" and another attribute called "data":
SELECT * from A, A, B;
here, i will have 2 columns "data", PQftable tells me that they are from A, but
which of the 2 columns "p" is the primary key of the tuple (of the table A)?
Is it possible to get distinguish the 2 instances of the table A?
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