From 0b584830f0efef400ef26da58e5c17f14cece3e7 Mon Sep 17 00:00:00 2001 From: Bruce Momjian Date: Tue, 25 Jun 2002 01:45:58 +0000 Subject: [PATCH] Update FAQ. --- doc/FAQ | 11 ++++++----- doc/src/FAQ/FAQ.html | 7 ++++--- 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/doc/FAQ b/doc/FAQ index a1f9d150ba..0cc05b3d3b 100644 --- a/doc/FAQ +++ b/doc/FAQ @@ -1,7 +1,7 @@ Frequently Asked Questions (FAQ) for PostgreSQL - Last updated: Sun Jun 23 17:16:13 EDT 2002 + Last updated: Mon Jun 24 21:45:50 EDT 2002 Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) @@ -743,13 +743,14 @@ using an index with ORDER BY and LIMIT: SELECT col FROM tab - ORDER BY col + ORDER BY col [ DESC ] LIMIT 1 When using wild-card operators such as LIKE or ~, indexes can only be - used if the beginning of the search is anchored to the start of the - string. Therefore, to use indexes, LIKE patterns must not start with - %, and ~(regular expression) patterns must start with ^. + used if the default C local is used during initdb and the beginning of + the search is anchored to the start of the string. Therefore, to use + indexes, LIKE patterns must not start with %, and ~(regular + expression) patterns must start with ^. 4.9) How do I see how the query optimizer is evaluating my query? diff --git a/doc/src/FAQ/FAQ.html b/doc/src/FAQ/FAQ.html index b6de1a6d49..3240a40685 100644 --- a/doc/src/FAQ/FAQ.html +++ b/doc/src/FAQ/FAQ.html @@ -14,7 +14,7 @@ alink="#0000ff">

Frequently Asked Questions (FAQ) for PostgreSQL

-

Last updated: Sun Jun 23 17:16:13 EDT 2002

+

Last updated: Mon Jun 24 21:45:50 EDT 2002

Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
@@ -946,12 +946,13 @@

     SELECT col
     FROM tab
-    ORDER BY col
+    ORDER BY col [ DESC ]
     LIMIT 1
 

When using wild-card operators such as LIKE or - ~, indexes can only be used if the beginning of the search + ~, indexes can only be used if the default C local is used +during initdb and the beginning of the search is anchored to the start of the string. Therefore, to use indexes, LIKE patterns must not start with %, and ~(regular expression) patterns must start with ^.

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