Remove IN/slow FAQ item because it only applies to <=7.3.X.

diff --git a/doc/FAQ b/doc/FAQ
index a4a320020e05106b0eb37ec90a7da7b006a61c32..269a86447de1cc81e6832cbcd7557b2aafda409d 100644 (file)
--- a/doc/FAQ
+++ b/doc/FAQ
@@ -1,7 +1,7 @@
 
                 Frequently Asked Questions (FAQ) for PostgreSQL
                                        
-   Last updated: Sat Jan 29 23:15:42 EST 2005
+   Last updated: Sat Jan 29 23:20:03 EST 2005
    
    Current maintainer: Bruce Momjian ([email protected])
    
@@ -76,13 +76,12 @@
    4.16) Why does my large-object operations get "invalid large obj
    descriptor"?
    4.17) How do I create a column that will default to the current time?
-   4.18) Why are my subqueries using IN so slow?
-   4.19) How do I perform an outer join?
-   4.20) How do I perform queries using multiple databases?
-   4.21) How do I return multiple rows or columns from a function?
-   4.22) Why can't I reliably create/drop temporary tables in PL/PgSQL
+   4.18) How do I perform an outer join?
+   4.19) How do I perform queries using multiple databases?
+   4.20) How do I return multiple rows or columns from a function?
+   4.21) Why can't I reliably create/drop temporary tables in PL/PgSQL
    functions?
-   4.23) What encryption options are available?
+   4.22) What encryption options are available?
    
                             Extending PostgreSQL
                                       
@@ -922,28 +921,7 @@ BYTEA           bytea           variable-length byte array (null-byte safe)
    Use CURRENT_TIMESTAMP:
 CREATE TABLE test (x int, modtime timestamp DEFAULT CURRENT_TIMESTAMP );
 
-    4.18) Why are my subqueries using IN so slow?
-    
-   In versions prior to 7.4, subqueries were joined to outer queries by
-   sequentially scanning the result of the subquery for each row of the
-   outer query. If the subquery returns only a few rows and the outer
-   query returns many rows, IN is fastest. To speed up other queries,
-   replace IN with EXISTS:
-    SELECT *
-    FROM tab
-    WHERE col IN (SELECT subcol FROM subtab);
-
-   to:
-    SELECT *
-    FROM tab
-    WHERE EXISTS (SELECT subcol FROM subtab WHERE subcol = col);
-
-   For this to be fast, subcol should be an indexed column.
-   
-   In version 7.4 and later, IN actually uses the same sophisticated join
-   techniques as normal queries, and is prefered to using EXISTS.
-   
-    4.19) How do I perform an outer join?
+    4.18) How do I perform an outer join?
     
    PostgreSQL supports outer joins using the SQL standard syntax. Here
    are two examples:
@@ -973,7 +951,7 @@ CREATE TABLE test (x int, modtime timestamp DEFAULT CURRENT_TIMESTAMP );
     WHERE tab1.col1 NOT IN (SELECT tab2.col1 FROM tab2)
     ORDER BY col1
 
-    4.20) How do I perform queries using multiple databases?
+    4.19) How do I perform queries using multiple databases?
     
    There is no way to query a database other than the current one.
    Because PostgreSQL loads database-specific system catalogs, it is
@@ -983,12 +961,12 @@ CREATE TABLE test (x int, modtime timestamp DEFAULT CURRENT_TIMESTAMP );
    course, a client can make simultaneous connections to different
    databases and merge the results on the client side.
    
-    4.21) How do I return multiple rows or columns from a function?
+    4.20) How do I return multiple rows or columns from a function?
     
    In 7.3, you can easily return multiple rows or columns from a
    function, http://techdocs.postgresql.org/guides/SetReturningFunctions.
    
-    4.22) Why can't I reliably create/drop temporary tables in PL/PgSQL
+    4.21) Why can't I reliably create/drop temporary tables in PL/PgSQL
     functions?
     
    PL/PgSQL caches function contents, and an unfortunate side effect is
@@ -999,7 +977,7 @@ CREATE TABLE test (x int, modtime timestamp DEFAULT CURRENT_TIMESTAMP );
    table access in PL/PgSQL. This will cause the query to be reparsed
    every time.
    
-    4.23) What encryption options are available?
+    4.22) What encryption options are available?
     
      * contrib/pgcrypto contains many encryption functions for use in SQL
        queries.

diff --git a/doc/src/FAQ/FAQ.html b/doc/src/FAQ/FAQ.html
index 0b8401ec2ac366fbfdab8ba8e64e828e3c6fe8bc..d79d62c06e4e79bd7dc05a5b18d1be35497eb530 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: Sat Jan 29 23:15:42 EST 2005
+    Last updated: Sat Jan 29 23:20:03 EST 2005
 
     Current maintainer: Bruce Momjian (
     "mailto:[email protected]">[email protected])
@@ -114,16 +114,14 @@
     "invalid large obj descriptor"?
      4.17) How do I create a column that will
     default to the current time?
-     4.18) Why are my subqueries using
-    IN so slow?
-     4.19) How do I perform an outer join?
-     4.20) How do I perform queries using multiple
+     4.18) How do I perform an outer join?
+     4.19) How do I perform queries using multiple
     databases?
-     1">4.21) How do I return multiple rows or columns
+     0">4.20) How do I return multiple rows or columns
     from a function?
-     2">4.22) Why can't I reliably create/drop
+     1">4.21) Why can't I reliably create/drop
     temporary tables in PL/PgSQL functions?
-     3">4.23) What encryption options are available?
+     2">4.22) What encryption options are available?
      
 
     Extending PostgreSQL
@@ -1155,31 +1153,7 @@ BYTEA           bytea           variable-length byte array (null-byte safe)
 
 
 
-    4.18) Why are my subqueries using
-    IN so slow?
-
-    In versions prior to 7.4, subqueries were joined to outer queries
-    by sequentially scanning the result of the subquery for each row of
-    the outer query. If the subquery returns only a few rows and the outer
-    query returns many rows, IN is fastest.  To
-    speed up other queries, replace IN with
-    EXISTS:
-    SELECT *
-    FROM tab
-    WHERE col IN (SELECT subcol FROM subtab);
-
-    to:
-    SELECT *
-    FROM tab
-    WHERE EXISTS (SELECT subcol FROM subtab WHERE subcol = col);
-
-
-    For this to be fast, subcol should be an indexed column.
-    In version 7.4 and later,  IN actually uses the same
-    sophisticated join techniques as normal queries, and is prefered
-    to using EXISTS.
-
-    4.19) How do I perform an outer join?
+    4.18) How do I perform an outer join?
 
     PostgreSQL supports outer joins using the SQL standard syntax.
     Here are two examples:
@@ -1219,7 +1193,7 @@ BYTEA           bytea           variable-length byte array (null-byte safe)
     ORDER BY col1
 
 
-    20">4.20) How do I perform queries using
+    19">4.19) How do I perform queries using
     multiple databases?
 
     There is no way to query a database other than the current one.
@@ -1231,7 +1205,7 @@ BYTEA           bytea           variable-length byte array (null-byte safe)
     connections to different databases and merge the results on the
     client side.
 
-    1">4.21) How do I return multiple rows or
+    0">4.20) How do I return multiple rows or
     columns from a function?
 
     In 7.3, you can easily return multiple rows or columns from a
@@ -1239,7 +1213,7 @@ BYTEA           bytea           variable-length byte array (null-byte safe)
     
     http://techdocs.postgresql.org/guides/SetReturningFunctions.
 
-    2">4.22) Why can't I reliably create/drop
+    1">4.21) Why can't I reliably create/drop
     temporary tables in PL/PgSQL functions?
     PL/PgSQL caches function contents, and an unfortunate side effect
     is that if a PL/PgSQL function accesses a temporary table, and that
@@ -1249,7 +1223,7 @@ BYTEA           bytea           variable-length byte array (null-byte safe)
     EXECUTE for temporary table access in PL/PgSQL. This
     will cause the query to be reparsed every time.
 
-    3">4.23) What encryption options are available?
+    2">4.22) What encryption options are available?
     
     
     contrib/pgcrypto contains many encryption functions for