Best practice: Computations or Source

Hi,
Question about what's the best use.
If you write a SQL query to get a value out of a database for a field on your page. What is the best way to do this.
- By setting a computation (with the query) on that field
- Or write te query in the source attribute of that field
Both will have the same result.
But what's the best practice?

Hello Davy,
>> Both will have the same result.
That’s not entirely correct.
If you are using the SQL query in the item’s Source value or expression field, the retrieved value will not set Session State. Computation, on the other hand, will set Session State.
Also, bear in mind that firing the Source content depends on how you set the Sourced Used field. If you set it to Only when … it will be fired only when the value of the item in session state is null.
>> But what's the best practice?
There isn’t any. It actually depends on what you need to achieve. If, for example, you need to set Session State, you only have one option.
Regards,
Arie.
&diams; Please remember to mark appropriate posts as correct/helpful. For the long run, it will benefit us all.
&diams; Author of Oracle Application Express 3.2 – The Essentials and More

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Edited by: Rinne on Sep 23, 2010 11:05 AM

Rinne wrote:
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Please follow basic Netiquette and post the DDL we need to answer this. Follow industry and ANSI/ISO standards in your data. You should follow ISO-11179 rules for naming data elements. You should follow ISO-8601 rules for displaying temporal data. We need
to know the data types, keys and constraints on the table. Avoid dialect in favor of ANSI/ISO Standard SQL. And you need to read and download the PDF for:
https://www.simple-talk.com/books/sql-books/119-sql-code-smells/
>> My final data table contains a two key columns unique key constraint. [unh? one two-column key or two one column keys? Sure wish you posted DDL] I insert data into this table from a daily capture table (which also contains the two columns that make
up the key in the final data table but are not constrained (not unique) in the daily capture table). <<
Then the "capture table" is not a table at all! Remember the fist day of your RDBMS class? A table has to have a key. You need to fix this error. What ETL tool do you use?
>> I don't want to insert rows from daily capture which already exists in final data table (based on the two key columns). <<
MERGE statement; Google it. And do not use temp tables.
--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
in Sets / Trees and Hierarchies in SQL

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