Postgres Database Error Codes and Error Messages

Hi,

I am new to working on Postgres database and want to explore it fully.
Right now, I am interested in knowing all the predefined database error
codes with error messages for situations like "No Data Found" and "Too many
rows" during a query operation, "Duplicate key found" during an insert
operation, "Data Type Mismatch" during a conversion operation and many more
situations as identified and defined in an Oracle database.

I could not find a similar list of predefined error codes anywhere in
Postgres documentation.

Please revert back with the appropriate source of this information as soon
as possible.

Thanks,
Abhishek