Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commitf3fde99

Browse files
author
Thomas G. Lockhart
committed
Augment info on string functions per Jose Soares' suggestions.
1 parentbda6246 commitf3fde99

File tree

1 file changed

+95
-59
lines changed

1 file changed

+95
-59
lines changed

‎doc/src/sgml/func.sgml‎

Lines changed: 95 additions & 59 deletions
Original file line numberDiff line numberDiff line change
@@ -65,54 +65,86 @@ available through operators and may be documented as operators only.
6565
</Para>
6666
</sect1>
6767

68-
<sect1>
69-
<title>String Functions</title>
68+
<sect1>
69+
<title>String Functions</title>
7070

71-
<Para>
72-
SQL92 defines string functions with specific syntax. Some of these
73-
are implemented using other <ProductName>Postgres</ProductName> functions.
74-
</Para>
71+
<Para>
72+
SQL92 defines string functions with specific syntax. Some of these
73+
are implemented using other <ProductName>Postgres</ProductName> functions.
74+
The supported string types for <acronym>SQL92</acronym> are
75+
<type>char</type>, <type>varchar</type>, and <type>text</type>.
76+
</Para>
7577

76-
<Para>
77-
<TABLE TOCENTRY="1">
78-
<TITLE><Acronym>SQL92</Acronym> String Functions</TITLE>
79-
<TGROUP COLS="4">
80-
<THEAD>
81-
<ROW>
82-
<ENTRY>Function</ENTRY>
83-
<ENTRY>Returns</ENTRY>
84-
<ENTRY>Description</ENTRY>
85-
<ENTRY>Example</ENTRY>
86-
</ROW>
87-
</THEAD>
88-
<TBODY>
89-
<ROW>
90-
<ENTRY> position(text in text) </ENTRY>
91-
<ENTRY> int4 </ENTRY>
92-
<ENTRY> location of specified substring </ENTRY>
93-
<ENTRY> position('o' in 'Tom') </ENTRY>
94-
</ROW>
95-
<ROW>
96-
<ENTRY> substring(text [from int] [for int]) </ENTRY>
97-
<ENTRY> text </ENTRY>
98-
<ENTRY> extract specified substring </ENTRY>
99-
<ENTRY> substring('Tom' from 2 for 2) </ENTRY>
100-
</ROW>
101-
<ROW>
102-
<ENTRY> trim([leading|trailing|both] [text] from text) </ENTRY>
103-
<ENTRY> text </ENTRY>
104-
<ENTRY> trim characters from text </ENTRY>
105-
<ENTRY> trim(both 'x' from 'xTomx') </ENTRY>
106-
</ROW>
107-
</TBODY>
108-
</TGROUP>
109-
</TABLE>
110-
</Para>
78+
<Para>
79+
<TABLE TOCENTRY="1">
80+
<TITLE><Acronym>SQL92</Acronym> String Functions</TITLE>
81+
<TGROUP COLS="4">
82+
<THEAD>
83+
<ROW>
84+
<ENTRY>Function</ENTRY>
85+
<ENTRY>Returns</ENTRY>
86+
<ENTRY>Description</ENTRY>
87+
<ENTRY>Example</ENTRY>
88+
</ROW>
89+
</THEAD>
90+
<TBODY>
91+
<ROW>
92+
<ENTRY> char_length(string) </ENTRY>
93+
<ENTRY> int4 </ENTRY>
94+
<ENTRY> length of string </ENTRY>
95+
<ENTRY> char_length('jose') </ENTRY>
96+
</ROW>
97+
<ROW>
98+
<ENTRY> character_length(string) </ENTRY>
99+
<ENTRY> int4 </ENTRY>
100+
<ENTRY> length of string </ENTRY>
101+
<ENTRY> char_length('jose') </ENTRY>
102+
</ROW>
103+
<ROW>
104+
<ENTRY> lower(string) </ENTRY>
105+
<ENTRY> string </ENTRY>
106+
<ENTRY> convert string to lower case </ENTRY>
107+
<ENTRY> lower('TOM') </ENTRY>
108+
</ROW>
109+
<ROW>
110+
<ENTRY> octet_length(string) </ENTRY>
111+
<ENTRY> int4 </ENTRY>
112+
<ENTRY> storage length of string </ENTRY>
113+
<ENTRY> octet_length('jose') </ENTRY>
114+
</ROW>
115+
<ROW>
116+
<ENTRY> position(string in string) </ENTRY>
117+
<ENTRY> int4 </ENTRY>
118+
<ENTRY> location of specified substring </ENTRY>
119+
<ENTRY> position('o' in 'Tom') </ENTRY>
120+
</ROW>
121+
<ROW>
122+
<ENTRY> substring(string [from int] [for int]) </ENTRY>
123+
<ENTRY> string </ENTRY>
124+
<ENTRY> extract specified substring </ENTRY>
125+
<ENTRY> substring('Tom' from 2 for 2) </ENTRY>
126+
</ROW>
127+
<ROW>
128+
<ENTRY> trim([leading|trailing|both] [string] from string) </ENTRY>
129+
<ENTRY> string </ENTRY>
130+
<ENTRY> trim characters from string </ENTRY>
131+
<ENTRY> trim(both 'x' from 'xTomx') </ENTRY>
132+
</ROW>
133+
<ROW>
134+
<ENTRY> upper(text) </ENTRY>
135+
<ENTRY> text </ENTRY>
136+
<ENTRY> convert text to upper case </ENTRY>
137+
<ENTRY> upper('tom') </ENTRY>
138+
</ROW>
139+
</TBODY>
140+
</TGROUP>
141+
</TABLE>
142+
</Para>
111143

112-
<Para>
113-
Many string functions are available for text, varchar(), and char() types.
114-
Some are used internally to implement the SQL92 string functions listed above.
115-
</Para>
144+
<Para>
145+
Many additional string functions are available for text, varchar(), and char() types.
146+
Some are used internally to implement the SQL92 string functions listed above.
147+
</Para>
116148

117149
<Para>
118150
<TABLE TOCENTRY="1">
@@ -146,12 +178,6 @@ Some are used internally to implement the SQL92 string functions listed above.
146178
<ENTRY> initcap('thomas') </ENTRY>
147179
</ROW>
148180
<ROW>
149-
<ENTRY> lower(text) </ENTRY>
150-
<ENTRY> text </ENTRY>
151-
<ENTRY> convert text to lower case </ENTRY>
152-
<ENTRY> lower('TOM') </ENTRY>
153-
</ROW>
154-
<ROW>
155181
<ENTRY> lpad(text,int,text) </ENTRY>
156182
<ENTRY> text </ENTRY>
157183
<ENTRY> left pad string to specified length </ENTRY>
@@ -164,9 +190,9 @@ Some are used internally to implement the SQL92 string functions listed above.
164190
<ENTRY> ltrim('xxxxtrim','x') </ENTRY>
165191
</ROW>
166192
<ROW>
167-
<ENTRY>position(text,text) </ENTRY>
193+
<ENTRY>textpos(text,text) </ENTRY>
168194
<ENTRY> text </ENTRY>
169-
<ENTRY>extract specified substring </ENTRY>
195+
<ENTRY>locate specified substring </ENTRY>
170196
<ENTRY> position('high','ig') </ENTRY>
171197
</ROW>
172198
<ROW>
@@ -217,12 +243,6 @@ Some are used internally to implement the SQL92 string functions listed above.
217243
<ENTRY> convert text to varchar type </ENTRY>
218244
<ENTRY> varchar('text string') </ENTRY>
219245
</ROW>
220-
<ROW>
221-
<ENTRY> upper(text) </ENTRY>
222-
<ENTRY> text </ENTRY>
223-
<ENTRY> convert text to upper case </ENTRY>
224-
<ENTRY> upper('tom') </ENTRY>
225-
</ROW>
226246
</TBODY>
227247
</TGROUP>
228248
</TABLE>
@@ -689,3 +709,19 @@ support functions.
689709

690710
</chapter>
691711

712+
<!-- Keep this comment at the end of the file
713+
Local variables:
714+
mode: sgml
715+
sgml-omittag:t
716+
sgml-shorttag:t
717+
sgml-minimize-attributes:nil
718+
sgml-always-quote-attributes:t
719+
sgml-indent-step:1
720+
sgml-indent-data:t
721+
sgml-parent-document:nil
722+
sgml-default-dtd-file:"./reference.ced"
723+
sgml-exposed-tags:nil
724+
sgml-local-catalogs:"/usr/lib/sgml/catalog"
725+
sgml-local-ecat-files:nil
726+
End:
727+
-->

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp