Обсуждение: Inheritance c.cities ??

Looking at the Postgresql manual in the inheritance section I see
abbreviations.

i.e.
SELECT c.name, c.altitude
FROM cities* c
WHERE c.altitude > 500;

c.name  of course refering to cities.name
 My question is where is there an alias reference of  c AS cities

How does and where does the  cities become c.  How does Postgresql
recognize the change.


bob T

R Talbot wrote:
  >Looking at the Postgresql manual in the inheritance section I see
  >abbreviations.
  >
  >i.e.
  >SELECT c.name, c.altitude
  >FROM cities* c
  >WHERE c.altitude > 500;
  >
  >c.name  of course refering to cities.name
  > My question is where is there an alias reference of  c AS cities
  >
  >How does and where does the  cities become c.  How does Postgresql
  >recognize the change.

Here:

  >FROM cities* c

This is equivalent to "FROM cities* AS c".

In the current release, "cities" is equivalent to "cities*"; to get rows
from cities alone you need to use "FROM ONLY cities"

--
Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
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      man his thoughts; and let him return unto the LORD,
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R Talbot wrote:
>
> Looking at the Postgresql manual in the inheritance section I see
> abbreviations.
>
> i.e.
> SELECT c.name, c.altitude
> FROM cities* c
> WHERE c.altitude > 500;
>
> c.name  of course refering to cities.name
>  My question is where is there an alias reference of  c AS cities
>
> How does and where does the  cities become c.  How does Postgresql
> recognize the change.


FROM cities* c is the same as
FROM cities* AS c
I personally would prefer it if everyone used the AS when it is implied
as, IMHO, it makes such statements much clearer.


>
> bob T
>
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R Talbot wrote:

> R Talbot wrote:
>
> > Looking at the Postgresql manual in the inheritance section I see
> > abbreviations.
> >
> > i.e.
> > SELECT c.name, c.altitude
> > FROM cities* c
> > WHERE c.altitude > 500;
> >
> > c.name  of course refering to cities.name
> >  My question is where is there an alias reference of  c AS cities
> >
> > How does and where does the  cities become c.  How does Postgresql
> > recognize the change.
> >
> > bob T
>
> Thank You
>
>  I answered my question..
>
> Bob T

Thank You

I answered my own question...

Bob T