1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<refentry id="fn_datediff">
<refmeta>
<refentrytitle>datediff</refentrytitle>
<refmiscinfo>time</refmiscinfo>
</refmeta>
<refnamediv>
<refname>datediff</refname>
<refpurpose>get difference of 2 dates</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_datediff">
<funcprototype id="fproto_datediff">
<funcdef><function>datediff</function></funcdef>
<paramdef>in <parameter>unit</parameter> string</paramdef>
<paramdef>in <parameter>date1</parameter> datetime</paramdef>
<paramdef>in <parameter>date2</parameter> datetime</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_datediff"><title>Description</title>
<para>datediff subtracts date1 from date2 and returns the difference as
an integer in the specified units.</para>
</refsect1>
<refsect1 id="params_datediff"><title>Parameters</title>
<refsect2><title>unit</title>
<para>The resulting unit name as a string. May be 'millisecond', 'second', 'minute', 'hour', 'day',
'month', or 'year'</para>
</refsect2>
<refsect2><title>date1</title>
<para>The <type>datetime</type> value that will be subtracted from
<parameter>date2</parameter></para>
</refsect2>
<refsect2><title>date2</title>
<para>The <type>datetime</type> value <parameter>date1</parameter>
is subtracted from</para>
</refsect2>
</refsect1>
<refsect1 id="ret_datediff"><title>Return Values</title>
<para>Difference of <parameter>date1</parameter> and
<parameter>date2</parameter> as an <type>integer</type>.</para>
</refsect1>
<refsect1 id="errors_datediff"><title>Errors</title>
<table><title>Errors signalled by <function>datediff</function></title>
<tgroup cols="4">
<thead><row><entry>SQLState</entry><entry>Error Code</entry><entry>Error Text</entry><entry>Description</entry></row></thead>
<tbody>
<row>
<entry><errorcode>22023</errorcode></entry>
<entry><errorcode>DT002</errorcode></entry>
<entry><errorname>Bad unit in datediff: >offending unit string<</errorname></entry>
<entry>The unit given was not one of the units listed above.</entry>
</row>
</tbody>
</tgroup>
</table>
</refsect1>
<refsect1 id="examples_datediff"><title>Examples</title>
<example id="ex_datediff"><title>A simple example</title>
<para>Get hour difference of 1996.10.10 and 1996.10.11.</para>
<screen>SQL> SELECT datediff ('hour', stringdate ('1996.10.10'), stringdate ('1996.10.11'));
callret
INTEGER
_________________________________________________________________________
24
1 Rows. -- 57 msec.
</screen>
</example>
<example id="ex_datediff_2"><title>Demo DB example</title>
<para>Get average order processing time in days</para>
<screen>
SQL> use "Demo";
SQL> SELECT avg (datediff ('day', "OrderDate", "ShippedDate"))
as "Avg_Processing_Time" from "Orders" where "ShippedDate" is not null;
Avg_Processing_Time
INTEGER
_________________________________________________________________________
8
1 Rows. -- 11 msec.
</screen>
</example>
</refsect1>
<refsect1 id="seealso_datediff"><title>See Also</title>
<para><link linkend="fn_dateadd"><function>dateadd</function></link>,
<link linkend="fn_datestring"><function>datestring</function></link></para>
</refsect1>
</refentry>
|
