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Commitf176e37

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Document a bunch of formerly-undocumented date/time operators,
including the SQL-spec OVERLAPS construct.
1 parent05dddf4 commitf176e37

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‎doc/src/sgml/func.sgml

Lines changed: 118 additions & 21 deletions
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@@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.169 2003/08/31 17:32:18 petere Exp $
2+
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.170 2003/09/08 19:38:02 tgl Exp $
33
PostgreSQL documentation
44
-->
55

@@ -4575,8 +4575,8 @@ substring('foobar' from 'o(.)b') <lineannotation>o</lineannotation>
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<tbody>
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<row>
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<entry> <literal>+</literal> </entry>
4578-
<entry><literal>timestamp '2001-09-28 01:00' +interval '23 hours'</literal></entry>
4579-
<entry><literal>timestamp '2001-09-29 00:00'</literal></entry>
4578+
<entry><literal>date '2001-09-28' +integer '7'</literal></entry>
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<entry><literal>date '2001-10-05'</literal></entry>
45804580
</row>
45814581

45824582
<row>
@@ -4585,16 +4585,58 @@ substring('foobar' from 'o(.)b') <lineannotation>o</lineannotation>
45854585
<entry><literal>timestamp '2001-09-28 01:00'</literal></entry>
45864586
</row>
45874587

4588+
<row>
4589+
<entry> <literal>+</literal> </entry>
4590+
<entry><literal>date '2001-09-28' + time '03:00'</literal></entry>
4591+
<entry><literal>timestamp '2001-09-28 03:00'</literal></entry>
4592+
</row>
4593+
4594+
<row>
4595+
<entry> <literal>+</literal> </entry>
4596+
<entry><literal>time '03:00' + date '2001-09-28'</literal></entry>
4597+
<entry><literal>timestamp '2001-09-28 03:00'</literal></entry>
4598+
</row>
4599+
4600+
<row>
4601+
<entry> <literal>+</literal> </entry>
4602+
<entry><literal>interval '1 day' + interval '1 hour'</literal></entry>
4603+
<entry><literal>interval '1 day 01:00'</literal></entry>
4604+
</row>
4605+
4606+
<row>
4607+
<entry> <literal>+</literal> </entry>
4608+
<entry><literal>timestamp '2001-09-28 01:00' + interval '23 hours'</literal></entry>
4609+
<entry><literal>timestamp '2001-09-29 00:00'</literal></entry>
4610+
</row>
4611+
45884612
<row>
45894613
<entry> <literal>+</literal> </entry>
45904614
<entry><literal>time '01:00' + interval '3 hours'</literal></entry>
45914615
<entry><literal>time '04:00'</literal></entry>
45924616
</row>
45934617

4618+
<row>
4619+
<entry> <literal>+</literal> </entry>
4620+
<entry><literal>interval '3 hours' + time '01:00'</literal></entry>
4621+
<entry><literal>time '04:00'</literal></entry>
4622+
</row>
4623+
45944624
<row>
45954625
<entry> <literal>-</literal> </entry>
4596-
<entry><literal>timestamp '2001-09-28 23:00' - interval '23 hours'</literal></entry>
4597-
<entry><literal>timestamp '2001-09-28'</literal></entry>
4626+
<entry><literal>- interval '23 hours'</literal></entry>
4627+
<entry><literal>interval '-23:00'</literal></entry>
4628+
</row>
4629+
4630+
<row>
4631+
<entry> <literal>-</literal> </entry>
4632+
<entry><literal>date '2001-10-01' - date '2001-09-28'</literal></entry>
4633+
<entry><literal>integer '3'</literal></entry>
4634+
</row>
4635+
4636+
<row>
4637+
<entry> <literal>-</literal> </entry>
4638+
<entry><literal>date '2001-10-01' - integer '7'</literal></entry>
4639+
<entry><literal>date '2001-09-24'</literal></entry>
45984640
</row>
45994641

46004642
<row>
@@ -4603,28 +4645,58 @@ substring('foobar' from 'o(.)b') <lineannotation>o</lineannotation>
46034645
<entry><literal>timestamp '2001-09-27 23:00'</literal></entry>
46044646
</row>
46054647

4648+
<row>
4649+
<entry> <literal>-</literal> </entry>
4650+
<entry><literal>time '05:00' - time '03:00'</literal></entry>
4651+
<entry><literal>interval '02:00'</literal></entry>
4652+
</row>
4653+
46064654
<row>
46074655
<entry> <literal>-</literal> </entry>
46084656
<entry><literal>time '05:00' - interval '2 hours'</literal></entry>
46094657
<entry><literal>time '03:00'</literal></entry>
46104658
</row>
46114659

4660+
<row>
4661+
<entry> <literal>-</literal> </entry>
4662+
<entry><literal>timestamp '2001-09-28 23:00' - interval '23 hours'</literal></entry>
4663+
<entry><literal>timestamp '2001-09-28 00:00'</literal></entry>
4664+
</row>
4665+
4666+
<row>
4667+
<entry> <literal>-</literal> </entry>
4668+
<entry><literal>interval '1 day' - interval '1 hour'</literal></entry>
4669+
<entry><literal>interval '23:00'</literal></entry>
4670+
</row>
4671+
46124672
<row>
46134673
<entry> <literal>-</literal> </entry>
46144674
<entry><literal>interval '2 hours' - time '05:00'</literal></entry>
4615-
<entry><literal>time '03:00:00'</literal></entry>
4675+
<entry><literal>time '03:00'</literal></entry>
4676+
</row>
4677+
4678+
<row>
4679+
<entry> <literal>-</literal> </entry>
4680+
<entry><literal>timestamp '2001-09-29 03:00' - timestamp '2001-09-27 12:00'</literal></entry>
4681+
<entry><literal>interval '1 day 15:00'</literal></entry>
4682+
</row>
4683+
4684+
<row>
4685+
<entry> <literal>*</literal> </entry>
4686+
<entry><literal>double precision '3.5' * interval '1 hour'</literal></entry>
4687+
<entry><literal>interval '03:30'</literal></entry>
46164688
</row>
46174689

46184690
<row>
46194691
<entry> <literal>*</literal> </entry>
4620-
<entry><literal>interval '1 hour' *int '3'</literal></entry>
4621-
<entry><literal>interval '03:00'</literal></entry>
4692+
<entry><literal>interval '1 hour' *double precision '3.5'</literal></entry>
4693+
<entry><literal>interval '03:30'</literal></entry>
46224694
</row>
46234695

46244696
<row>
46254697
<entry> <literal>/</literal> </entry>
4626-
<entry><literal>interval '1 hour' /int '3'</literal></entry>
4627-
<entry><literal>interval '00:20'</literal></entry>
4698+
<entry><literal>interval '1 hour' /double precision '1.5'</literal></entry>
4699+
<entry><literal>interval '00:40'</literal></entry>
46284700
</row>
46294701
</tbody>
46304702
</tgroup>
@@ -4714,7 +4786,7 @@ substring('foobar' from 'o(.)b') <lineannotation>o</lineannotation>
47144786
linkend="functions-datetime-trunc">
47154787
</entry>
47164788
<entry><literal>date_trunc('hour', timestamp '2001-02-16 20:38:40')</literal></entry>
4717-
<entry><literal>2001-02-16 20:00:00+00</literal></entry>
4789+
<entry><literal>2001-02-16 20:00:00</literal></entry>
47184790
</row>
47194791

47204792
<row>
@@ -4788,14 +4860,36 @@ substring('foobar' from 'o(.)b') <lineannotation>o</lineannotation>
47884860
<entry>Current date and time; see <xref
47894861
linkend="functions-datetime-current">
47904862
</entry>
4791-
<entry><literal>timeofday()</literal></entry>
4792-
<entry><literal>Wed Feb 21 17:01:13.000126 2001 EST</literal></entry>
4863+
<entry></entry>
4864+
<entry></entry>
47934865
</row>
47944866

47954867
</tbody>
47964868
</tgroup>
47974869
</table>
47984870

4871+
<para>
4872+
In addition to these functions, the SQL <literal>OVERLAPS</> keyword is
4873+
supported:
4874+
<synopsis>
4875+
( <replaceable>start1</replaceable>, <replaceable>end1</replaceable> ) OVERLAPS ( <replaceable>start2</replaceable>, <replaceable>end2</replaceable> )
4876+
( <replaceable>start1</replaceable>, <replaceable>length1</replaceable> ) OVERLAPS ( <replaceable>start2</replaceable>, <replaceable>length2</replaceable> )
4877+
</synopsis>
4878+
This expression yields true when two time periods (defined by their
4879+
endpoints) overlap, false when they do not overlap. The endpoints
4880+
can be specified as pairs of dates, times, or timestamps; or as
4881+
a date, time, or timestamp followed by an interval.
4882+
</para>
4883+
4884+
<screen>
4885+
SELECT (DATE '2001-02-16', DATE '2001-12-21') OVERLAPS
4886+
(DATE '2001-10-30', DATE '2002-10-30');
4887+
<lineannotation>Result: </lineannotation><computeroutput>true</computeroutput>
4888+
SELECT (DATE '2001-02-16', INTERVAL '100 days') OVERLAPS
4889+
(DATE '2001-10-30', DATE '2002-10-30');
4890+
<lineannotation>Result: </lineannotation><computeroutput>false</computeroutput>
4891+
</screen>
4892+
47994893
<sect2 id="functions-datetime-extract">
48004894
<title><function>EXTRACT</function>, <function>date_part</function></title>
48014895

@@ -4906,8 +5000,8 @@ SELECT EXTRACT(DOY FROM TIMESTAMP '2001-02-16 20:38:40');
49065000
</para>
49075001

49085002
<screen>
4909-
SELECT EXTRACT(EPOCH FROM TIMESTAMP '2001-02-16 20:38:40');
4910-
<lineannotation>Result: </lineannotation><computeroutput>982352320</computeroutput>
5003+
SELECT EXTRACT(EPOCH FROM TIMESTAMPWITH TIME ZONE'2001-02-16 20:38:40-08');
5004+
<lineannotation>Result: </lineannotation><computeroutput>982384720</computeroutput>
49115005

49125006
SELECT EXTRACT(EPOCH FROM INTERVAL '5 days 3 hours');
49135007
<lineannotation>Result: </lineannotation><computeroutput>442800</computeroutput>
@@ -5156,11 +5250,14 @@ SELECT date_part('hour', INTERVAL '4 hours 3 minutes');
51565250
date_trunc('<replaceable>field</replaceable>', <replaceable>source</replaceable>)
51575251
</synopsis>
51585252
<replaceable>source</replaceable> is a value expression of type
5159-
<type>timestamp</type>. (Values of type <type>date</type> and
5160-
<type>time</type> are cast automatically.)
5253+
<type>timestamp</type> or <type>interval</>.
5254+
(Values of type <type>date</type> and
5255+
<type>time</type> are cast automatically, to <type>timestamp</type> or
5256+
<type>interval</> respectively.)
51615257
<replaceable>field</replaceable> selects to which precision to
5162-
truncate the time stamp value. The return value is of type
5163-
<type>timestamp</type> with all fields that are less than the
5258+
truncate the input value. The return value is of type
5259+
<type>timestamp</type> or <type>interval</>
5260+
with all fields that are less significant than the
51645261
selected one set to zero (or one, for day and month).
51655262
</para>
51665263

@@ -5185,10 +5282,10 @@ date_trunc('<replaceable>field</replaceable>', <replaceable>source</replaceable>
51855282
Examples:
51865283
<screen>
51875284
SELECT date_trunc('hour', TIMESTAMP '2001-02-16 20:38:40');
5188-
<lineannotation>Result: </lineannotation><computeroutput>2001-02-16 20:00:00+00</computeroutput>
5285+
<lineannotation>Result: </lineannotation><computeroutput>2001-02-16 20:00:00</computeroutput>
51895286

51905287
SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40');
5191-
<lineannotation>Result: </lineannotation><computeroutput>2001-01-01 00:00:00+00</computeroutput>
5288+
<lineannotation>Result: </lineannotation><computeroutput>2001-01-01 00:00:00</computeroutput>
51925289
</screen>
51935290
</para>
51945291
</sect2>

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