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What about tables without primary keys?

• rzzzt 4y ago
  DBMS-s still have to identify a particular row somehow. That identifier is CTID in Postgres and ROWID in Oracle. Both will change if the data is moved around.
• deleted 4y ago
  [deleted]
• lgas 4y ago
  Generally not a good idea to have these at all.
• wielebny 4y ago
  These are usually stored in CSV files.