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Case 1:
I start a connection to the DB
I BEGIN a TRANSACTION
I close the connection
What happens to the transaction?
Case 2:
I start a connection to the DB
I BEGIN a TRANSACTION
I start a concurrent connection to the same DB
With the second connection I modify the contents of a table
With the first connection I ROLLBACK the TRANSACTION
What happens to the modifications?
Case 1: roll back
Case 2: at step 4, you can’t modify rows which are touched by the first connection so there’s no effect: the second connection can’t modify, it will wait (due to the locks).