Convert String to Number



In workbench we have a process, which will accept the PDF as Input and converts to xml. I have one attribute which is coming as string but in database thats stored as Varchar. But uisng that i have to compare >=  and < todetermine further logic by executing a SQL query or by conditions. The SQL Query is failing as even if i try to convert to number using experession its still not working.

Any help would be greatly appreciated.

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