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NULL, empty string and values

From LimeSurvey Manual

Details on the difference between NULL, empty string and values in the database response table.

TODO

DECIMAL and DATE cannot be "empty string".

TODO: Exclusive option

TODO: Slider

Example: Slider with default value is NULL if not shown.

TODO: Relevance equation 0 with default value? Always hidden with default value?

TODO: Hidden by attribute VS hidden by relevance equation.