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Add MERGE TODO.detail:

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>   [merge]
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Bruce Momjian 2005-12-01 22:12:35 +00:00
parent f28bdd95c1
commit 915fb7f687
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doc/TODO
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PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Thu Dec 1 17:07:44 EST 2005
Last updated: Thu Dec 1 17:12:27 EST 2005
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
@ -370,12 +370,14 @@ SQL Commands
* Add a GUC variable to warn about non-standard SQL usage in queries
* Add SQL-standard MERGE command, typically used to merge two tables
[merge]
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
[merge]
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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doc/src/FAQ/TODO.html
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<body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF">
<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: Thu Dec 1 17:07:44 EST 2005
Last updated: Thu Dec 1 17:12:27 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>.
@ -340,11 +340,13 @@ first.
</p>
</li><li>Add a GUC variable to warn about non-standard SQL usage in queries
</li><li>Add SQL-standard MERGE command, typically used to merge two tables
[<a href="http://momjian.postgresql.org/cgi-bin/pgtodo?merge">merge</a>]
<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
[<a href="http://momjian.postgresql.org/cgi-bin/pgtodo?merge">merge</a>]
<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