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help / color / mirror / Atom feedFrom: David Fetter <[email protected]>
To: PostgreSQL Docs <[email protected]>
To: PostgreSQL Patches <[email protected]>
Subject: Example for UPDATE FROM with correllation
Date: Thu, 12 Jan 2006 14:17:27 -0800
Message-ID: <[email protected]> (raw)
Folks,
Please find enclosed a doc patch that adds an example of a correllated
UPDATE.
Cheers,
D
--
David Fetter [email protected] http://fetter.org/
phone: +1 415 235 3778
Remember to vote!
Index: doc/src/sgml/ref/update.sgml
===================================================================
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/ref/update.sgml,v
retrieving revision 1.33
diff -c -r1.33 update.sgml
*** doc/src/sgml/ref/update.sgml 12 Oct 2005 23:19:22 -0000 1.33
--- doc/src/sgml/ref/update.sgml 12 Jan 2006 22:04:40 -0000
***************
*** 213,218 ****
--- 213,230 ----
(SELECT sales_person FROM accounts WHERE name = 'Acme Corporation');
</programlisting>
+ Now that all the papers are signed, update the most recently closed
+ deal of the travelling salesperson who closed the Rocket Powered
+ Skates deal with the Acme Corporation.
+ <programlisting>
+ UPDATE employees SET last_closed_deal = deal.id
+ FROM accounts JOIN deals ON (account.id = deal.account_id)
+ WHERE deal.employee_id = employees.id
+ AND deal.name = 'Rocket Powered Skates'
+ AND accounts.name = 'Acme Corporation'
+ ORDER BY deal.signed_date DESC LIMIT 1;
+ </programlisting>
+
Attempt to insert a new stock item along with the quantity of stock. If
the item already exists, instead update the stock count of the existing
item. To do this without failing the entire transaction, use savepoints.
Attachments:
[text/plain] correllated_update.diff (1.2K, 2-correllated_update.diff)
download | inline diff:
Index: doc/src/sgml/ref/update.sgml
===================================================================
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/ref/update.sgml,v
retrieving revision 1.33
diff -c -r1.33 update.sgml
*** doc/src/sgml/ref/update.sgml 12 Oct 2005 23:19:22 -0000 1.33
--- doc/src/sgml/ref/update.sgml 12 Jan 2006 22:04:40 -0000
***************
*** 213,218 ****
--- 213,230 ----
(SELECT sales_person FROM accounts WHERE name = 'Acme Corporation');
</programlisting>
+ Now that all the papers are signed, update the most recently closed
+ deal of the travelling salesperson who closed the Rocket Powered
+ Skates deal with the Acme Corporation.
+ <programlisting>
+ UPDATE employees SET last_closed_deal = deal.id
+ FROM accounts JOIN deals ON (account.id = deal.account_id)
+ WHERE deal.employee_id = employees.id
+ AND deal.name = 'Rocket Powered Skates'
+ AND accounts.name = 'Acme Corporation'
+ ORDER BY deal.signed_date DESC LIMIT 1;
+ </programlisting>
+
Attempt to insert a new stock item along with the quantity of stock. If
the item already exists, instead update the stock count of the existing
item. To do this without failing the entire transaction, use savepoints.
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