[3.12] gh-96165: Clarify omitting the FROM clause in SQLite queries (GH-106513) (#106645)

(cherry picked from commit fc7ff1a)

Co-authored-by: Mariusz Felisiak <[email protected]>

Author: miss-islington

Doc/library/sqlite3.rst

@@ -2522,6 +2522,13 @@ Queries now return :class:`!Row` objects:
    >>> row["RADIUS"]  # Column names are case-insensitive.
    6378
 
+.. note::
+
+    The ``FROM`` clause can be omitted in the ``SELECT`` statement, as in the
+    above example. In such cases, SQLite returns a single row with columns
+    defined by expressions, e.g. literals, with the given aliases
+    ``expr AS alias``.
+
 You can create a custom :attr:`~Cursor.row_factory`
 that returns each row as a :class:`dict`, with column names mapped to values: