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Oracle PL/SQL/Analytical Functions/VAR POP - История изменений
2026-04-04T10:38:58Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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Admin: 1 версия
2010-05-26T09:56:02Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==VAR_POP(expr): calculates the population variance==<br />
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<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
SQL><br />
SQL><br />
SQL> create table TestTable (<br />
2 x number primary key,<br />
3 y number<br />
4 );<br />
Table created.<br />
SQL> insert into TestTable values (1, 7 );<br />
1 row created.<br />
SQL> insert into TestTable values (2, 1 );<br />
1 row created.<br />
SQL> insert into TestTable values (3, 2 );<br />
1 row created.<br />
SQL> insert into TestTable values (4, 5 );<br />
1 row created.<br />
SQL> insert into TestTable values (5, 7 );<br />
1 row created.<br />
SQL> insert into TestTable values (6, 34 );<br />
1 row created.<br />
SQL> insert into TestTable values (7, 32 );<br />
1 row created.<br />
SQL> insert into TestTable values (8, 43 );<br />
1 row created.<br />
SQL> insert into TestTable values (9, 87 );<br />
1 row created.<br />
SQL><br />
SQL> select * from TestTable;<br />
X Y<br />
---------- ----------<br />
1 7<br />
2 1<br />
3 2<br />
4 5<br />
5 7<br />
6 34<br />
7 32<br />
8 43<br />
9 87<br />
9 rows selected.<br />
SQL><br />
SQL> --VAR_POP(expr): calculates the population variance.<br />
SQL><br />
SQL> --VAR_POP(expr)<br />
SQL><br />
SQL> SELECT VAR_POP(y) FROM TestTable;<br />
VAR_POP(Y)<br />
----------<br />
716.17284<br />
SQL><br />
SQL> drop table TestTable;<br />
Table dropped.<br />
SQL><br />
SQL><br />
<br />
</source></div>
Admin