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NULLS in PL/SQL:

NULLS in PL/SQL:

 - Represents unknown or inapplicable values
 - Never equal or not equal to anything
 - Most functions other than NVL, NVL2, CONCAT, REPLACE will return NULL when passed a Null
 - Use IS null OR IS NOT NULL to check NULL values

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java.lang.IllegalArgumentException: Unsupported class file major version 60

- Check the stack trace and version of Java. - Update the correct Java Version to resolve the Exception.