Update LIMIT/FETCH FAQ item.

diff --git a/doc/FAQ b/doc/FAQ
index 884a9e7aa5e13de628a9903e85478b5bdb09060b..c092e10b9cfca55ebb42b2f1da79a973d2a954d0 100644 (file)
--- a/doc/FAQ
+++ b/doc/FAQ
@@ -1,7 +1,7 @@
 
                 Frequently Asked Questions (FAQ) for PostgreSQL
                                        
-   Last updated: Mon Jan 31 19:18:44 EST 2005
+   Last updated: Mon Jan 31 20:35:58 EST 2005
    
    Current maintainer: Bruce Momjian ([email protected])
    
@@ -445,17 +445,13 @@
     PostgreSQL releases?
     
    The PostgreSQL team makes only small changes between minor releases,
-   so upgrading from 7.2 to 7.2.1 does not require a dump and restore.
-   However, major releases (e.g. from 7.2 to 7.3) often change the
+   so upgrading from 7.4 to 7.4.1 does not require a dump and restore.
+   However, major releases (e.g. from 7.3 to 7.4) often change the
    internal format of system tables and data files. These changes are
-   often complex, so we don't maintain backward compatability for data
+   often complex, so we don't maintain backward compatibility for data
    files. A dump outputs data in a generic format that can then be loaded
    in using the new internal format.
    
-   In releases where the on-disk format does not change, the pg_upgrade
-   script can be used to upgrade without a dump/restore. The release
-   notes mention whether pg_upgrade is available for the release.
-   
     3.8) What computer hardware should I use?
     
    Because PC hardware is mostly compatible, people tend to believe that
@@ -471,13 +467,10 @@
                                       
     4.1) How do I SELECT only the first few rows of a query? A random row?
     
-   See the FETCH manual page, or use SELECT ... LIMIT....
-   
-   The entire query may have to be evaluated, even if you only want the
-   first few rows. Consider using a query that has an ORDER BY. If there
-   is an index that matches the ORDER BY, PostgreSQL may be able to
-   evaluate only the first few records requested, or the entire query may
-   have to be evaluated until the desired rows have been generated.
+   To retrieve only a few rows, if you know at the number of rows needed
+   at the time of the SELECT use LIMIT . If an index matches the ORDER BY
+   it is possible the entire query does not have to be executed. If you
+   don't know the number of rows at SELECT time, use a cursor and FETCH.
    
    To SELECT a random row, use:
     SELECT col

diff --git a/doc/src/FAQ/FAQ.html b/doc/src/FAQ/FAQ.html
index 4c8a9a9ab2a24ed94f4638f49ef87206ebdafc15..1385d5901271cf75e3527ca556a2e554b2605626 100644 (file)
--- a/doc/src/FAQ/FAQ.html
+++ b/doc/src/FAQ/FAQ.html
@@ -10,7 +10,7 @@
   alink="#0000ff">
     Frequently Asked Questions (FAQ) for PostgreSQL
 
-    Last updated: Mon Jan 31 19:18:44 EST 2005
+    Last updated: Mon Jan 31 20:35:58 EST 2005
 
     Current maintainer: Bruce Momjian (
     "mailto:[email protected]">[email protected])
@@ -590,18 +590,13 @@
     to upgrade between major PostgreSQL releases?
 
     The PostgreSQL team makes only small changes between minor releases,
-    so upgrading from 7.2 to 7.2.1 does not require a dump and restore.
-    However, major releases (e.g. from 7.2 to 7.3) often change the internal
+    so upgrading from 7.4 to 7.4.1 does not require a dump and restore.
+    However, major releases (e.g. from 7.3 to 7.4) often change the internal
     format of system tables and data files. These changes are often complex,
-    so we don't maintain backward compatability for data files. A dump outputs
+    so we don't maintain backward compatibility for data files. A dump outputs
     data in a generic format that can then be loaded in using the new internal
     format.
 
-    In releases where the on-disk format does not change, the
-    pg_upgrade script can be used to upgrade without a dump/restore.
-    The release notes mention whether pg_upgrade is available for the
-    release.
-
     3.8) What computer hardware should I use?
 
     Because PC hardware is mostly compatible, people tend to believe that
@@ -619,15 +614,13 @@
     4.1) How do I SELECT only the
     first few rows of a query?  A random row?
 
-    See the FETCH manual page, or use
-    SELECT ... LIMIT....
-
-    The entire query may have to be evaluated, even if you only want
-    the first few rows. Consider using a query that has an ORDER
-    BY. If there is an index that matches the ORDER
-    BY, PostgreSQL may be able to evaluate only the first few
-    records requested, or the entire query may have to be evaluated
-    until the desired rows have been generated.
+    To retrieve only a few rows, if you know at the number of rows
+    needed at the time of the SELECT use
+    LIMIT . If an index matches the ORDER
+    BY it is possible the entire query does not have to be
+    executed. If you don't know the number of rows at
+    SELECT time, use a cursor and
+    FETCH.
 
     To SELECT a random row, use: