PostgreSQL 9.5.x
I logged onto PostgreSQL. I did a command:
Delete from some_table;
I realized that I should have had a where clause. So I canceled the delete with CTRL-C. PostgreSQL said to canceled the delete.
Did PostgreSQL delete any records?
Mostly what Kevin said - though the first thing you should consider doing next time is "BEGIN;"
A single statement either succeeds or fails atomically - so either it deleted ALL records or none.
Once within a transaction you get to change your mind up until you issue a "COMMIT;"
David J.