to_number question 2004-07-15 - By Jonathan Gennick
Thursday, July 15, 2004, 10:06:04 AM, Wolfgang Breitling (breitliw@(protected)) 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@(protected)
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