Evalution routine in PL/SQL

We have one table day_fact(ID, Value, ...)
I have to generate user-defined results in same table with another ID.
How can I evaluate user-defined math. expression?
Which PL/SQL package's routine simply can calculate it?
I'm new to Oracle and OTN forums, therefore dint't know -- will your answers relays to me via e-mail or not. If not, send carbon copy to me. Thank You.

Hi .....
If I understand what you requirement is, you want an end user to be able to construct a mathematical expression that will be parsed and executed by Oracle using PL/SQL in a runtime environment.
If this is so, then you will probably want to use dynamic SQL.
There are two types of dynamic SQL. One using the DBMS_SQL supplied package and the newer native dynamic SQL. You will find a comparison at......
otn.oracle.com/docs/products/oracle8i/doc_library/817_doc/appdev.817/a76939/adg09dyn.htm#15124 Note: You may have to edit out the '<br>'s put in by the Forum code to get the URL to work. Also you may have append some of the URL which may be truncated, usually the bookmark(#nnnn).
A good explanation of native dynamic SQL with lots of code examples can be found at....
[URLotn.oracle.com/docs/products/oracle8i/doc_library/817_doc/appdev.817/a77069/10_dynam.htm#4376[/URL] Note: You may have to edit out the '<br>'s put in by the Forum code to get the URL to work. Also you may have append some of the URL which may be truncated, usually the bookmark(#nnnn).
I find that native dynamic SQL is easier to use although I have used the DBMS_SQL for a long time.
DBMS_SQL also has the ability to accept very long source using a index-by (PL/SQL) table. An advantage in some cases. Oracle's documentation contains a lot about DBMS_SQL, but a good place to start is...
otn.oracle.com/docs/products/oracle8i/doc_library/817_doc/appdev.817/a76936/dbms_sql.htm#998100 Note: You may have to edit out the '<br>'s put in by the Forum code to get the URL to work. Also you may have append some of the URL which may be truncated, usually the bookmark(#nnnn).
Hope this helps. Good Luck.

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Available software in the Test Environment:
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When I tried to use the following command for step 2 -
make -f $ORACLE_HOME/rdbms/demo/demo_rdbms.mk extproc_callback \
SHARED_LIBNAME=cmd_lib.so \
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{code}
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{code}
{code}
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http://asktom.oracle.com/pls/asktom/f?p=100:11:::::P11_QUESTION_ID:3696816290928

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Hi Guys
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Product
Instance
Feature
Lanugauge
Edition
Version
Sql Server 2008
DAV01
Database Engine Serveices
1033
Standard
10.0.1600.22
Sql Server 2008
DAV01
SQL Server Replication
1033
Standard
10.0.1600.22
Sql Server 2008
DAV01
Analysis Services
1033
Standard
10.0.1600.22
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Management tools basic
1033
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Sql Server 2008 R2
Management tools Complete
1033
Enterprise Evaliation
10.50.1600.1
Sql Server 2008 R2
Integration Services
1033
Enterprise Evaliation
10.50.1600.1
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