[badrequest]

All that is well and good, but RETURNING is a Postgres feature, not part of the SQL standard. I don't think a standard SQL textbook (especially one targeting something like MySQL/Sqlite) would have taught the author about it.

[fabian2k]

I was quite surprised when I found out that RETURNING is actually a Postgres feature, and not standard. It just felt like such an obvious and extremely useful thing to have.

[AdrianB1]

RETURNING exists also in Oracle PL/SQL and it is called OUTPUT in T-SQL. It may exist in other SQL variants.