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Oracle PL/SQL Tutorial/Function Procedure Packages/Recursive Functions - История изменений
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в 13:45, 26 мая 2010
2010-05-26T13:45:46Z
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Admin: 1 версия
2010-05-26T10:11:55Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== Recursion==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
SQL><br />
SQL> create or replace function factorial (i NUMBER)<br />
2 return NUMBER<br />
3 is<br />
4 begin<br />
5 if i = 1<br />
6 then<br />
7 return 1;<br />
8 else<br />
9 return i*factorial(i-1);<br />
10 end if;<br />
11 end;<br />
12 /<br />
Function created.</source><br />
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<br />
<br />
== Recursive functions==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
SQL><br />
SQL> set serveroutput on<br />
SQL> set echo on<br />
SQL><br />
SQL> CREATE OR REPLACE FUNCTION Factorial(p_MyNum INTEGER) RETURN NUMBER AS<br />
2 BEGIN<br />
3 IF p_MyNum = 1 THEN -- Checking for last value to process of n-1<br />
4 RETURN 1;<br />
5 ELSE<br />
6 RETURN(p_MyNum * Factorial(p_MyNum-1)); -- Recursive<br />
7 END IF;<br />
8 END;<br />
9 /<br />
Function created.<br />
SQL><br />
SQL> BEGIN<br />
2 DBMS_OUTPUT.PUT_LINE(factorial(10));<br />
3 END;<br />
4 /<br />
3628800<br />
PL/SQL procedure successfully completed.</source></div>
Admin