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JasperReport - error with conditional parameter in SQL

 
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I'm trying to have a query that returns all rows if user_id parameter is NULL/empty. The same query should return a specific row if user_id is not NULL/empty. I did some Googling and found the following suggestion. However, when I preview the Jasper report in the iReport, I hit a Oracle missing keyword error. I checked my syntax and it seems to be okay.

Any help is appreciated!

 
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