Augment info on string functions per Jose Soares' suggestions.

doc/src/sgml/func.sgml

@@ -65,54 +65,86 @@ available through operators and may be documented as operators only.
 </Para>
 </sect1>
 
-<sect1>
-<title>String Functions</title>
+  <sect1>
+   <title>String Functions</title>
 
-<Para>
-SQL92 defines string functions with specific syntax. Some of these
-are implemented using other <ProductName>Postgres</ProductName> functions.
-</Para>
+   <Para>
+    SQL92 defines string functions with specific syntax. Some of these
+    are implemented using other <ProductName>Postgres</ProductName> functions.
+    The supported string types for <acronym>SQL92</acronym> are
+    <type>char</type>, <type>varchar</type>, and <type>text</type>.
+   </Para>
 
-<Para>
-<TABLE TOCENTRY="1">
-<TITLE><Acronym>SQL92</Acronym> String Functions</TITLE>
-<TGROUP COLS="4">
-<THEAD>
-  <ROW>
-    <ENTRY>Function</ENTRY>
-    <ENTRY>Returns</ENTRY>
-    <ENTRY>Description</ENTRY>
-    <ENTRY>Example</ENTRY>
-  </ROW>
-</THEAD>
-<TBODY>
-  <ROW>
-<ENTRY> position(text in text) </ENTRY>
-<ENTRY> int4 </ENTRY>
-<ENTRY> location of specified substring </ENTRY>
-<ENTRY> position('o' in 'Tom') </ENTRY>
-  </ROW>
-  <ROW>
-<ENTRY> substring(text [from int] [for int]) </ENTRY>
-<ENTRY> text </ENTRY>
-<ENTRY> extract specified substring </ENTRY>
-<ENTRY> substring('Tom' from 2 for 2) </ENTRY>
-  </ROW>
-  <ROW>
-<ENTRY> trim([leading|trailing|both] [text] from text) </ENTRY>
-<ENTRY> text </ENTRY>
-<ENTRY> trim characters from text </ENTRY>
-<ENTRY> trim(both 'x' from 'xTomx') </ENTRY>
-  </ROW>
-</TBODY>
-</TGROUP>
-</TABLE>
-</Para>
+   <Para>
+    <TABLE TOCENTRY="1">
+     <TITLE><Acronym>SQL92</Acronym> String Functions</TITLE>
+     <TGROUP COLS="4">
+      <THEAD>
+       <ROW>
+	<ENTRY>Function</ENTRY>
+	<ENTRY>Returns</ENTRY>
+	<ENTRY>Description</ENTRY>
+	<ENTRY>Example</ENTRY>
+       </ROW>
+      </THEAD>
+      <TBODY>
+       <ROW>
+	<ENTRY> char_length(string) </ENTRY>
+	<ENTRY> int4 </ENTRY>
+	<ENTRY> length of string </ENTRY>
+	<ENTRY> char_length('jose') </ENTRY>
+       </ROW>
+       <ROW>
+	<ENTRY> character_length(string) </ENTRY>
+	<ENTRY> int4 </ENTRY>
+	<ENTRY> length of string </ENTRY>
+	<ENTRY> char_length('jose') </ENTRY>
+       </ROW>
+       <ROW>
+	<ENTRY> lower(string) </ENTRY>
+	<ENTRY> string </ENTRY>
+	<ENTRY> convert string to lower case </ENTRY>
+	<ENTRY> lower('TOM') </ENTRY>
+       </ROW>
+       <ROW>
+	<ENTRY> octet_length(string) </ENTRY>
+	<ENTRY> int4 </ENTRY>
+	<ENTRY> storage length of string </ENTRY>
+	<ENTRY> octet_length('jose') </ENTRY>
+       </ROW>
+       <ROW>
+	<ENTRY> position(string in string) </ENTRY>
+	<ENTRY> int4 </ENTRY>
+	<ENTRY> location of specified substring </ENTRY>
+	<ENTRY> position('o' in 'Tom') </ENTRY>
+       </ROW>
+       <ROW>
+	<ENTRY> substring(string [from int] [for int]) </ENTRY>
+	<ENTRY> string </ENTRY>
+	<ENTRY> extract specified substring </ENTRY>
+	<ENTRY> substring('Tom' from 2 for 2) </ENTRY>
+       </ROW>
+       <ROW>
+	<ENTRY> trim([leading|trailing|both] [string] from string) </ENTRY>
+	<ENTRY> string </ENTRY>
+	<ENTRY> trim characters from string </ENTRY>
+	<ENTRY> trim(both 'x' from 'xTomx') </ENTRY>
+       </ROW>
+       <ROW>
+	<ENTRY> upper(text) </ENTRY>
+	<ENTRY> text </ENTRY>
+	<ENTRY> convert text to upper case </ENTRY>
+	<ENTRY> upper('tom') </ENTRY>
+       </ROW>
+      </TBODY>
+     </TGROUP>
+    </TABLE>
+   </Para>
 
-<Para>
-Many string functions are available for text, varchar(), and char() types.
-Some are used internally to implement the SQL92 string functions listed above.
-</Para>
+   <Para>
+    Many additional string functions are available for text, varchar(), and char() types.
+    Some are used internally to implement the SQL92 string functions listed above.
+   </Para>
 
 <Para>
 <TABLE TOCENTRY="1">
@@ -146,12 +178,6 @@ Some are used internally to implement the SQL92 string functions listed above.
 <ENTRY> initcap('thomas') </ENTRY>
   </ROW>
   <ROW>
-<ENTRY> lower(text) </ENTRY>
-<ENTRY> text </ENTRY>
-<ENTRY> convert text to lower case </ENTRY>
-<ENTRY> lower('TOM') </ENTRY>
-  </ROW>
-  <ROW>
 <ENTRY> lpad(text,int,text) </ENTRY>
 <ENTRY> text </ENTRY>
 <ENTRY> left pad string to specified length </ENTRY>
@@ -164,9 +190,9 @@ Some are used internally to implement the SQL92 string functions listed above.
 <ENTRY> ltrim('xxxxtrim','x') </ENTRY>
   </ROW>
   <ROW>
-<ENTRY> position(text,text) </ENTRY>
+<ENTRY> textpos(text,text) </ENTRY>
 <ENTRY> text </ENTRY>
-<ENTRY> extract specified substring </ENTRY>
+<ENTRY> locate specified substring </ENTRY>
 <ENTRY> position('high','ig') </ENTRY>
   </ROW>
   <ROW>
@@ -217,12 +243,6 @@ Some are used internally to implement the SQL92 string functions listed above.
 <ENTRY> convert text to varchar type </ENTRY>
 <ENTRY> varchar('text string') </ENTRY>
   </ROW>
-  <ROW>
-<ENTRY> upper(text) </ENTRY>
-<ENTRY> text </ENTRY>
-<ENTRY> convert text to upper case </ENTRY>
-<ENTRY> upper('tom') </ENTRY>
-  </ROW>
 </TBODY>
 </TGROUP>
 </TABLE>
@@ -689,3 +709,19 @@ support functions.
 
 </chapter>
 
+<!-- Keep this comment at the end of the file
+Local variables:
+mode: sgml
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+sgml-shorttag:t
+sgml-minimize-attributes:nil
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+sgml-local-catalogs:"/usr/lib/sgml/catalog"
+sgml-local-ecat-files:nil
+End:
+-->