The front-end system has "ALL" as a dropdown option. I do not want to blow out the "ALL" into individual elements...
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
because it will potentially increase my database 100-fold. My other options are to write the SQL to look for both the actual value (eg. US) and then look for "ALL", but that would be too slow for our system. Is there any way solve this problem elegantly? eg. Country dropdown - All, US, FR, etc
A front-end system with a dropdown implies a backend script that generates the SQL based on the value passed over in the form's dropdown field. The best way to handle the situation is to put a conditional statement into the script that tests for the ALL value and avoids generating the WHERE clause. Here's how it might look in ColdFusion --
<CFQUERY NAME="queryname" DATASOURCE="#ds#"> select * from yourTable <CFIF form.country IS "ALL"> <CFELSE> where country = '#form.country#' </CFIF> </CFQUERY>
Note that when the form's country field value is ALL, the WHERE clause is not generated, so the query will return all rows.
For More Information
- What do you think about this answer? E-mail the edtiors at editor@searchDatabase.com with your feedback.
- The Best SQL Web Links: tips, tutorials, scripts, and more.
- Have an SQL tip to offer your fellow DBAs and developers? The best tips submitted will receive a cool prize. Submit your tip today!
- Ask your technical SQL questions -- or help out your peers by answering them -- in our live discussion forums.
- Ask the Experts yourself: Our SQL, database design, Oracle, SQL Server, DB2, metadata, object-oriented and data warehousing gurus are waiting to answer your toughest questions.
Dig Deeper on Oracle and SQL
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.