Comment 1965 added to page xfunc-sql.html of version 7.4

Author: Andrew Droffner <adroffne@advance.net>
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In response to "There is no way to use a table_name as argument.",
programmers need to know that in Query-Language functions, the SQL  is PREPARED. It must follow the rules of prepared
statements.

Prepared statements must have explit DB objects (e.g. tables). They can only use variables in WHERE, INSERT-VALUES, or
UPDATE-assignments.

See the PostgreSQL PREPARE and EXECUTE statements.

Also, look up prepared statements in a general SQL textbook.
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