nulls in A Sentence

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    Unique fields that allow Nulls in Django.

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    (HashMap allows null values as key and value whereas Hashtable doesn't allow Nulls).

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    The HashMap class is roughly equivalent to Hashtable, except that it is unsynchronized and permits Nulls.

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    Count(f1) yields the number of input rows in which f1 is non-null, since count ignores Nulls;

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    A line containing fewer than N+1 columns is sorted as though it were padded with Nulls at the right end.

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