Re: Why can't I .........

Mounir,

> -- do a join between two databases within the same installation.
>
> ... where db1.table1.userid = db2.table2.userid

Because this is not supported on PostgreSQL.  There are a number of
reasons, and it may never be supported because there are drawbacks to
allowing databases to reference each other (mainly security).


> -- use labels to name columns in this way
>
> ... select col1 userid, col2 name from ...  (instead of using AS)

Because AS is the ANSI SQL 92 standard.  And we like standards.

> -- do an update with full referenced colomns
>
> ... update table1 set table1.col1=value

Because UPDATES, per the SQL 92 standard, are on one table only.  Thus
any refenced columns *must* belong to that table, and if so, why name
it?

-Josh Berkus


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