Re[4]: to_number question
- From: Jonathan Gennick <jonathan@xxxxxxxxxxx>
- To: Wolfgang Breitling <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 15 Jul 2004 10:31:42 -0400
Thursday, July 15, 2004, 10:06:04 AM, Wolfgang Breitling
(breitliw@xxxxxxxxxxxxx) wrote:
>> 1. The subquery defines a *new* table of rows.
WB> No, it does not.
Ok. I've started to do a bit of digging in the 1999 ANSI SQL
standard. Section 7.5 describes the FROM clause as
containing a <table reference list>:
FROM <table reference list>
<table reference list> ::= <table reference> ...
Later, section 7.6 defines <table reference> as follows:
<table reference> ::= <table primary> | <joined table>
<table primary> can be many things, one of which is a
<derived table>, and a <derived table>, in turn, is defined
as a <table subquery>.
The standard does seem here, to put a subquery in the FROM
clause on an equal footing with a table that you specify by
name. A subquery is simply another way of specifying a
table.
Best regards,
Jonathan Gennick --- Brighten the corner where you are
http://Gennick.com * 906.387.1698 * mailto:jonathan@xxxxxxxxxxx
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