http://www.postgresql.org/docs/9.4/static/transaction-iso.html
Table 13-1 shows the SQL standard isolation levels and what is and is not
guaranteed. Then the text goes on to explain how our implementation
differs from that table. Is there any opposition to actually adding a
similar table, 13-2, probably right after the paragraph, with the same
columns, three rows, and the corresponding possible/not-possible cell
values?
David J.