The programmer does not know what he has to calculate ahead of time.
The formulas are stored in the table. He takes the data out from the
table with the formula creates the string of data and operator. Then
adds:
create string:
sql_string := '1 ';
sql_string := sql_string || '+ ';
sql_string := sql_string || '1';
sql_string := 'select ' || sql_string || ' from dual;'
result := execute immediate
sql_string;
- Igor Neyman <ineyman_at_perceptron.com> wrote:
> Why don't you do:
>
> variable1 := 1+ 1;
>
> instead of "select (1+1) into variable1 from dual"?
>
> Igor Neyman, OCP DBA
> ineyman_at_perceptron.com
>
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Tuesday, April 02, 2002 2:03 PM
>
>
> > I am working on a database optimization project. My Shared pool is
> > filled with SQL like
> >
> > select 0 from dual;
> > select 1/1 from dual;
> > select 1 - 1/(2 + 2) from dual;
> >
> >
> > I tried to use the bind variables to minimize the literal SQL.
> However
> > I need a different SQL script for each case.
> >
> > select :b1 from dual;
> > select :b1/:b2 from dual;
> > select :b1 - :b2/(:b3 + :b4) from dual;
> >
> > first one will handle all cases for b1 from 0 to any number which
> is
> > good. And second sql will handle all the cases for any number for
> b1
> > and b2. So I do reduce the literal SQL. However, I need to know
> ahead
> > of time what type of data I am calculating and then use the
> appropriate
> > SQL.
> >
> > I think the easy solution would be to use arithmetic. That is to
> pass
> > the string like ( 1 + 1 / (2 -2) ) to some function that can return
> me
> > the result of this sting. So I would not be using SQL script, to
> > minimize SQL execution, sys.dual contention or literal SQL filling
> > shared pool and causing both library cache and shared pool. Not to
> > mention saving in CPU processing by not parsing SQL scripts.
> >
> > Anybody, aware of such function in PL/SQL? Is there any other way
> to do
> > calculations other than 'select 1 + 1 from dual' ?
> >
> > I would really appreciate if you could let me know.
> >
> > Thanks
> >
> > Mohammed Shakir
> >
> > =====
> > Mohammed Shakir
> > CompuSoft, Inc.
> > 11 Heather Way
> > East Brunswick, NJ 08816-2825
> > (732) 672-0464 (Cell)
> > (732) 257-6001 (Home)
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Yahoo! Tax Center - online filing with TurboTax
> > http://http://taxes.yahoo.com/
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Mohammed Shakir
> > INET: mshakir08816_at_yahoo.com
> >
> > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> > San Diego, California -- Public Internet access / Mailing
> Lists
> >
> --------------------------------------------------------------------
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> subscribing).
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Igor Neyman
> INET: ineyman_at_perceptron.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing
> Lists
> --------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
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Do You Yahoo!?
Yahoo! Tax Center - online filing with TurboTax
http://taxes.yahoo.com/
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Mohammed Shakir
INET: mshakir08816_at_yahoo.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
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also send the HELP command for other information (like subscribing).
Received on Tue Apr 02 2002 - 21:23:26 CST
