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Creating NULL values from text files

It is possible to define a symbol, which when it occurs in a text file or an inline clause will be interpreted as a real NULL value. Use the following statement:


The symbol <sym> is to be interpreted as NULL. <sym> may be any string.

In order to reset this functionality to the default interpretation, use:


Note: The use of NULLINTERPRET only affects data from text files and inline clauses.