PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
-Last updated: Mon Nov 28 21:02:36 EST 2005
+Last updated: Thu Dec 1 17:07:44 EST 2005
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
information.
* Add a GUC variable to warn about non-standard SQL usage in queries
-* Add MERGE command that does UPDATE/DELETE, or on failure, INSERT (rules,
- triggers?)
+* Add SQL-standard MERGE command, typically used to merge two tables
+
+ This is similar to UPDATE, then for unmatched rows, INSERT.
+ Whether concurrent access allows modifications which could cause
+ row loss is implementation independent.
+
+* Add REPLACE or UPSERT command that does UPDATE, or on failure, INSERT
To implement this cleanly requires that the table have a unique index
so duplicate checking can be easily performed. It is possible to
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<h1><a name="section_1">PostgreSQL TODO List</a></h1>
<p>Current maintainer: Bruce Momjian (<a href="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<br/>
-Last updated: Mon Nov 28 21:02:36 EST 2005
+Last updated: Thu Dec 1 17:07:44 EST 2005
</p>
<p>The most recent version of this document can be viewed at<br/>
<a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>.
information.
</p>
</li><li>Add a GUC variable to warn about non-standard SQL usage in queries
- </li><li>Add MERGE command that does UPDATE/DELETE, or on failure, INSERT (rules,
- triggers?)
+ </li><li>Add SQL-standard MERGE command, typically used to merge two tables
+<p> This is similar to UPDATE, then for unmatched rows, INSERT.
+ Whether concurrent access allows modifications which could cause
+ row loss is implementation independent.
+</p>
+ </li><li>Add REPLACE or UPSERT command that does UPDATE, or on failure, INSERT
<p> To implement this cleanly requires that the table have a unique index
so duplicate checking can be easily performed. It is possible to
do it without a unique index if we require the user to LOCK the table
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