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Update DELETE FROM:

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< * Allow DELETE to handle table aliases for self-joins
> * Allow an alias to be provided for the target table in UPDATE/DELETE
276,279c276,282
<   There is no way to create a table alias for the deleted table for use
<   in the DELETE WHERE clause.  The agreed approach is to allow a USING
<   clause to specify additional tables.  UPDATE already has an optional
<   FROM clause for this purpose.
>   This is not SQL-spec but many DBMSs allow it.
>
> * Allow additional tables to be specified in DELETE for joins
>
>   UPDATE already allows this (UPDATE...FROM) but we need similar
>   functionality in DELETE.  It's been agreed that the keyword should
>   be USING, to avoid anything as confusing as DELETE FROM a FROM b.
This commit is contained in:
Bruce Momjian 2004-08-10 17:30:47 +00:00
parent 2c29664b6b
commit f7667e4cfa
1 changed files with 9 additions and 6 deletions
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@ -5,7 +5,7 @@ TODO list for PostgreSQL
Bracketed items "[]" have more detail. Bracketed items "[]" have more detail.
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Tue Aug 10 11:00:16 EDT 2004 Last updated: Tue Aug 10 13:30:30 EDT 2004
The most recent version of this document can be viewed at the PostgreSQL web site, http://www.PostgreSQL.org. The most recent version of this document can be viewed at the PostgreSQL web site, http://www.PostgreSQL.org.
@ -271,12 +271,15 @@ Commands
The use of C-style backslashes (.e.g. \n, \r) in quoted strings is not The use of C-style backslashes (.e.g. \n, \r) in quoted strings is not
SQL-spec compliant, so allow such handling to be disabled. SQL-spec compliant, so allow such handling to be disabled.
* Allow DELETE to handle table aliases for self-joins * Allow an alias to be provided for the target table in UPDATE/DELETE
There is no way to create a table alias for the deleted table for use This is not SQL-spec but many DBMSs allow it.
in the DELETE WHERE clause. The agreed approach is to allow a USING
clause to specify additional tables. UPDATE already has an optional * Allow additional tables to be specified in DELETE for joins
FROM clause for this purpose.
UPDATE already allows this (UPDATE...FROM) but we need similar
functionality in DELETE. It's been agreed that the keyword should
be USING, to avoid anything as confusing as DELETE FROM a FROM b.
* Add CORRESPONDING BY to UNION/INTERSECT/EXCEPT * Add CORRESPONDING BY to UNION/INTERSECT/EXCEPT
* Allow REINDEX to rebuild all database indexes, remove /contrib/reindex * Allow REINDEX to rebuild all database indexes, remove /contrib/reindex