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Question #122

Author: admin
tags: SQL  
NULLIF(value1, value2) function...
...returns a null value if value1 equals value2; otherwise it returns value1.
...returns a null value if both value1 and value2 are not null.
...returns a null value if both value1 and value2 are null.
...returns the first of its arguments that is not null; null is returned only if all arguments are null.
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