Re: CREATE TABLE AS standard?

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От Bruce Momjian
Тема Re: CREATE TABLE AS standard?
Дата
Msg-id 200005011549.LAA19207@candle.pha.pa.us
обсуждение исходный текст
Ответ на Re: CREATE TABLE AS standard?  (Thomas Lockhart <lockhart@alumni.caltech.edu>)
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> > I know I use that version my self a lot more than the SELECT INTO
> > version. We probably got it 'free' from the CREATE VIEW semantics,
> > as Tom suggested. I tend to use it to 'materialize' a new table when
> > I'm altering schema (either denormalizing, or normalizing) and need to
> > convert the type of a column. It's a little handier than separate CREATE
> > TABLE and INSERT INTO statements, although it's semantically equivalent.
> 
> I implemented CREATE TABLE AS as a semantically clearer version of
> SELECT/INTO, which was (afaik) in the original Postgres95 and probably
> earlier.
> 
> They are equivalent. btw, I assume that Tom used the term "abuse" in
> the supportive sense of the word? :)
> 

I covered SELECT...INTO in my book, with a short paragraph showing
CREATE TABLE...AS is equivalent.  Which one should I use in my book as
the preferred?

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