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    `!Composable` objects can be joined using the ``+`` operator: the result
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        ...     [sql.SQL("insert into "), sql.Identifier("table")])
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    The *string* doesn't undergo any form of escaping, so it is not suitable to
    represent variable identifiers or values: you should only use it to pass
    constant strings representing templates or snippets of SQL statements; use
    other objects such as `Identifier` or `Literal` to represent variable
    parts.

    Example::

        >>> query = sql.SQL("select {0} from {1}").format(
        ...    sql.SQL(', ').join([sql.Identifier('foo'), sql.Identifier('bar')]),
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        :return: the union of the `!SQL` string with placeholders replaced
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        The method is similar to the Python `str.format()` method: the string
        template supports auto-numbered (``{}``), numbered (``{0}``,
        ``{1}``...), and named placeholders (``{name}``), with positional
        arguments replacing the numbered placeholders and keywords replacing
        the named ones. However placeholder modifiers (``{0!r}``, ``{0:<10}``)
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        Example::

            >>> print(sql.SQL("select * from {} where {} = %s")
            ...     .format(sql.Identifier('people'), sql.Identifier('id'))
            ...     .as_string(conn))
            select * from "people" where "id" = %s

            >>> print(sql.SQL("select * from {tbl} where {pkey} = %s")
            ...     .format(tbl=sql.Identifier('people'), pkey=sql.Identifier('id'))
            ...     .as_string(conn))
            select * from "people" where "id" = %s

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        Example::

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    A `Composable` representing an SQL identifier or a dot-separated sequence.

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    .. __: https://www.postgresql.org/docs/current/static/sql-syntax-lexical.html#         SQL-SYNTAX-IDENTIFIERS

    Example::

        >>> t1 = sql.Identifier("foo")
        >>> t2 = sql.Identifier("ba'r")
        >>> t3 = sql.Identifier('ba"z')
        >>> print(sql.SQL(', ').join([t1, t2, t3]).as_string(conn))
        "foo", "ba'r", "ba""z"

    Multiple strings can be passed to the object to represent a qualified name,
    i.e. a dot-separated sequence of identifiers.

    Example::

        >>> query = sql.SQL("select {} from {}").format(
        ...     sql.Identifier("table", "field"),
        ...     sql.Identifier("schema", "table"))
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        select "table"."field" from "schema"."table"

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    The string returned by `!as_string()` follows the normal :ref:`adaptation
    rules <python-types-adaptation>` for Python objects.

    Example::

        >>> s1 = sql.Literal("foo")
        >>> s2 = sql.Literal("ba'r")
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    Examples::

        >>> names = ['foo', 'bar', 'baz']

        >>> q1 = sql.SQL("insert into table ({}) values ({})").format(
        ...     sql.SQL(', ').join(map(sql.Identifier, names)),
        ...     sql.SQL(', ').join(sql.Placeholder() * len(names)))
        >>> print(q1.as_string(conn))
        insert into table ("foo", "bar", "baz") values (%s, %s, %s)

        >>> q2 = sql.SQL("insert into table ({}) values ({})").format(
        ...     sql.SQL(', ').join(map(sql.Identifier, names)),
        ...     sql.SQL(', ').join(map(sql.Placeholder, names)))
        >>> print(q2.as_string(conn))
        insert into table ("foo", "bar", "baz") values (%(foo)s, %(bar)s, %(baz)s)

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