How to stop the execution until a parameter is provided to query?

Hi, I use Oracle Application Express 4.2.3.00.08 on Windows 7. How can I stop running query until a parameter is provided? The report, I have a selection criteria on the top to move date and users have asked to date default null. So when I run the report, the query is executed with date = null and returns all zeros in the report. I want the report only to run until users actually add a date and enter the "submit" button. Help, please. Thank you very much in advance.

Oracle_Gal wrote:

Hi, I use Oracle Application Express 4.2.3.00.08 on Windows 7. How can I stop running query until a parameter is provided? The report, I have a selection criteria on the top to move date and users have asked to date default null. So when I run the report, the query is executed with date = null and returns all zeros in the report. I want the report only to run until users actually add a date and enter the "submit" button.

Add an additional predicate to the report where clause to check that the parameter is not null, like:

...
and :p1_date is not null
...

Moreover, do not make the entire state region until a value is submitted by using a region point is not null condition.

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