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PostgreSQL/Math Functions/log - История изменений
2026-04-06T18:48:23Z
История изменений этой страницы в вики
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http://sqle.ru/index.php?title=PostgreSQL/Math_Functions/log&diff=4766&oldid=prev
в 13:45, 26 мая 2010
2010-05-26T13:45:56Z
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http://sqle.ru/index.php?title=PostgreSQL/Math_Functions/log&diff=4767&oldid=prev
Admin: 1 версия
2010-05-26T10:14:15Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==log(10, 12.0) AS log_12, log(3, 12.0) AS "log 12, base 3";==<br />
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<!-- start source code --><br />
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<source lang="sql"><br />
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postgres=#<br />
postgres=# SELECT log(10, 12.0) AS log_12,<br />
postgres-# log(3, 12.0) AS "log 12, base 3";<br />
log_12 | log 12, base 3<br />
------------------------+--------------------<br />
1.07918124604762482772 | 2.2618595071429149<br />
(1 row)<br />
postgres=#<br />
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</source><br />
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==log(b numeric, x numeric) logarithm to base b==<br />
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<!-- start source code --><br />
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<source lang="sql"><br />
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postgres=# -- log(b numeric, x numeric) logarithm to base b<br />
postgres=#<br />
postgres=# select log(2.0, 64.0);<br />
log<br />
--------------------<br />
6.0000000000000000<br />
(1 row)<br />
postgres=#<br />
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</source><br />
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==log(b, x): Returns the base b logarithm of x==<br />
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<!-- start source code --><br />
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<source lang="sql"><br />
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postgres=#<br />
postgres=# -- log(b, x): Returns the base b logarithm of x<br />
postgres=# select log(exp(1.0), 10.0) AS natural_log;<br />
natural_log<br />
--------------------<br />
2.3025850929940457<br />
(1 row)<br />
postgres=#<br />
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</source><br />
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==log(dp or numeric) base 10 logarithm==<br />
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<!-- start source code --><br />
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<source lang="sql"><br />
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postgres=# -- log(dp or numeric) base 10 logarithm<br />
postgres=# select log(100.0);<br />
log<br />
--------------------<br />
2.0000000000000000<br />
(1 row)<br />
postgres=#<br />
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</source><br />
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==log(x): Returns the base 10 logarithm of x==<br />
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<!-- start source code --><br />
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<source lang="sql"><br />
postgres=# -- log(x): Returns the base 10 logarithm of x<br />
postgres=# SELECT log(12.0) AS log_12;<br />
log_12<br />
------------------------<br />
1.07918124604762482772<br />
(1 row)<br />
postgres=#<br />
<br />
</source></div>
Admin