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68d9fbeb55
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Thomas G. Lockhart 68d9fbeb55 Implement the IS DISTINCT FROM operator per SQL99. 
Reused the Expr node to hold DISTINCT which strongly resembles
 the existing OP info. Define DISTINCT_EXPR which strongly resembles
 the existing OPER_EXPR opType, but with handling for NULLs required
 by SQL99.
We have explicit support for single-element DISTINCT comparisons
 all the way through to the executor. But, multi-element DISTINCTs
 are handled by expanding into a comparison tree in gram.y as is done for
 other row comparisons. Per discussions, it might be desirable to move
 this into one or more purpose-built nodes to be handled in the backend.
Define the optional ROW keyword and token per SQL99.
 This allows single-element row constructs, which were formerly disallowed
 due to shift/reduce conflicts with parenthesized a_expr clauses.
Define the SQL99 TREAT() function. Currently, use as a synonym for CAST().
2002-07-04 15:24:11 +00:00
config Change PL/Perl and Pg interface build to use configured compiler and 2002-05-28 16:57:53 +00:00
contrib Disable pg_upgrade for 7.3. 2002-07-03 14:38:19 +00:00
doc Move INTERSECT DISTINCT to the supported category. Error in docs. 2002-07-04 15:10:43 +00:00
src Implement the IS DISTINCT FROM operator per SQL99. 2002-07-04 15:24:11 +00:00
aclocal.m4 Upgrade to Autoconf version 2.53. Replaced many custom macro 2002-03-29 17:32:55 +00:00
configure Change PL/Perl and Pg interface build to use configured compiler and 2002-05-28 16:57:53 +00:00
configure.in Change PL/Perl and Pg interface build to use configured compiler and 2002-05-28 16:57:53 +00:00
COPYRIGHT Update copyright to 2002. 2002-06-20 20:29:54 +00:00
GNUmakefile.in Upgrade to Autoconf version 2.53. Replaced many custom macro 2002-03-29 17:32:55 +00:00
HISTORY New wording: 2002-03-25 21:24:08 +00:00
INSTALL
Makefile
README
register.txt

README 

PostgreSQL Database Management System
=====================================
  
This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains several language
bindings, including C, C++, Perl, Python, and Tcl, as well as drivers
for JDBC and ODBC.

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Changes between all PostgreSQL releases are recorded in the
file HISTORY.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
ftp://ftp.postgresql.org/pub/.  For more information look at our web
site located at http://www.postgresql.org/.