From 505cdd5873aa101a58a80ee4bceb8000eb7f5a35 Mon Sep 17 00:00:00 2001
From: Bruce Momjian
Date: Mon, 22 Jan 2001 06:27:41 +0000
Subject: Update FAQ.
---
doc/src/FAQ/FAQ.html | 27 ++++++++++++++++-----------
1 file changed, 16 insertions(+), 11 deletions(-)
(limited to 'doc/src')
diff --git a/doc/src/FAQ/FAQ.html b/doc/src/FAQ/FAQ.html
index aff8e80df06..2ef4f1eceee 100644
--- a/doc/src/FAQ/FAQ.html
+++ b/doc/src/FAQ/FAQ.html
@@ -1224,21 +1224,26 @@ Lobby your company to join W3C, see http://www.w3.org/Consortium
4.24) How do I do an outer join?
- PostgreSQL 7.1 and later supports outer joins. Here is an
- example:
+ PostgreSQL 7.1 and later supports outer joins. Here are two
+ examples:
+
+ SELECT *
+ FROM t1 LEFT OUTER JOIN t2 ON (t1.col = t2.col);
+
+or
SELECT *
FROM t1 LEFT OUTER JOIN t2 USING (col);
- This will join t1.col to t2.col, and return any unjoined rows in t1
- with NULL values for t2 columns. A
- RIGHT join would return unjoined rows of table t2. A
- FULL join would return unjoined rows from t1 and t2.
- The word OUTER is optional and is assumed in
- LEFT, RIGHT, and FULL
- joins. Ordinary joins are called INNER joins.
-
- In previous releases, outer joins can be simulated using
+ These identical queries join t1.col to t2.col, and return any
+ unjoined rows in t1. A RIGHT join would return
+ unjoined rows of table t2. A FULL join would return
+ unjoined rows from t1 and t2. The word OUTER is
+ optional and is assumed in LEFT,
+ RIGHT, and FULL joins. Ordinary joins
+ are called INNER joins.
+
+ In previous releases, outer joins can be simulated using
UNION and NOT IN. For example, when
joining tab1 and tab2, the following query does an
outer join of the two tables:
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