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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