From: | Joe Conway <mail(at)joeconway(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-hackers(at)postgreSQL(dot)org |
Subject: | Re: Do FROM items of different schemas conflict? |
Date: | 2002-03-08 23:26:01 |
Message-ID: | 3C894889.200@joeconway.com |
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Lists: | pgsql-hackers |
Tom Lane wrote:
> Okay folks, time to put on your language-lawyer hats ...
>
> SELECT * FROM schema1.tab1, schema2.tab1;
>
> Is this allowed? SQL92 appears to allow it: section 6.3 <table
> reference> says:
FWIW:
This works in Oracle 8.1.6
Connected to Oracle8i Enterprise Edition Release 8.1.6.3.0
Connected as cyapps
SQL> select * from apps.plan_table, cyapps.plan_table;
<snip>
24 rows selected
> This restriction also suggests strongly that the spec authors intended
> to allow unqualified references to qualified FROM-items, viz:
>
> SELECT tab1.col1 FROM schema1.tab1;
>
...so does this...
SQL> select plan_table.operation from apps.plan_table;
<snip>
12 rows selected
> Comments? Is anyone familiar with the details of how other DBMSes
> handle these issues?
MSSQL 7 seems to handle the first syntax also, but not the second.
Joe
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