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Oracle PL/SQL/Numeric Math Functions/LOG - История изменений
2026-05-25T17:03:20Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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Admin: 1 версия
2010-05-26T09:55:13Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Get the log of 8, base 2==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL> -- create demo table<br />
SQL> create table TestTable(<br />
2 ID VARCHAR2(4 BYTE) NOT NULL,<br />
3 MyName VARCHAR2(10 BYTE),<br />
4 MyDate DATE,<br />
5 MyNumber Number(8,2)<br />
6 )<br />
7 /<br />
Table created.<br />
SQL><br />
SQL><br />
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19960711","YYYYMMDD"),12.12);<br />
1 row created.<br />
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19970622","YYYYMMDD"),1.12);<br />
1 row created.<br />
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19980513","YYYYMMDD"),22.1);<br />
1 row created.<br />
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19990624","YYYYMMDD"),2.12);<br />
1 row created.<br />
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("20000415","YYYYMMDD"),2.1);<br />
1 row created.<br />
SQL><br />
SQL><br />
SQL> select * from TestTable<br />
2<br />
SQL><br />
SQL> --Get the log of 8, base 2<br />
SQL> SELECT LOG(2,8), LOG(2,MyNumber) FROM TestTable;<br />
LOG(2,8) LOG(2,MYNUMBER)<br />
---------- ---------------<br />
3 3.59931779<br />
3 .163498732<br />
3 4.46597446<br />
3 1.08406426<br />
3 1.07038933<br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
SQL> drop table TestTable;<br />
Table dropped.<br />
SQL><br />
<br />
</source><br />
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==LOG(2, 5)==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL> select LOG(2, 5) from dual;<br />
LOG(2,5)<br />
----------<br />
2.32192809<br />
SQL><br />
SQL><br />
SQL><br />
<br />
</source><br />
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==LOG: The first argument is the base, and the second is the number that you want to take the log of==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL><br />
SQL> -- create demo table<br />
SQL> create table TestTable(<br />
2 ID VARCHAR2(4 BYTE) NOT NULL,<br />
3 MyName VARCHAR2(10 BYTE),<br />
4 MyDate DATE,<br />
5 MyNumber Number(8,2)<br />
6 )<br />
7 /<br />
Table created.<br />
SQL><br />
SQL><br />
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19960711","YYYYMMDD"),12.12);<br />
1 row created.<br />
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19970622","YYYYMMDD"),2.12);<br />
1 row created.<br />
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19980513","YYYYMMDD"),22.1);<br />
1 row created.<br />
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19990624","YYYYMMDD"),2.12);<br />
1 row created.<br />
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("20000415","YYYYMMDD"),2.1);<br />
1 row created.<br />
SQL><br />
SQL><br />
SQL> select * from TestTable<br />
2<br />
SQL><br />
SQL> --LOG: The first argument is the base, and the second is the number that you want to take the log of<br />
SQL><br />
SQL> SELECT LOG(MyNumber, 2) FROM TestTable;<br />
LOG(MYNUMBER,2)<br />
---------------<br />
.277830427<br />
.922454538<br />
.223915297<br />
.922454538<br />
.934239509<br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
SQL> drop table TestTable;<br />
<br />
</source><br />
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==LOG(x, y):Returns the logarithm, base x, of y==<br />
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<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL> --LOG(x, y):Returns the logarithm, base x, of y.<br />
SQL><br />
SQL> select LOG(2, 4) from dual;<br />
LOG(2,4)<br />
----------<br />
2<br />
SQL><br />
<br />
<br />
</source></div>
Admin