PostgreSQL Transaction Isolation Levels with Go ExamplesMay 14th 2020Illustration composed from MariaLetta/free-gophers-pack , original gopher by Renee French.
Transaction read some values from rows, and those values could be changes by concurrent translations, before the transaction ends.
Read committed , Repeatable read isolation levels: Test withisolation levels:Read Bob balance from transaction.
Read committed , Repeatable read isolation levels: Test withisolation levels:Read users with group_id=2 from the transaction.
Set second transaction isolation level the same to the main transaction.

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