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A null is the absence of a value in a column. Nulls indicate missing, unknown, or inapplicable data.

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Nulls are stored in the database if they fall between columns with data values. In these cases, they require 1 byte to store the length of the column (zero). Trailing nulls in a row require no storage because a new row header signals that the remaining columns in the previous row are null. For example, if the last three columns of a table are null, then no data is stored for these columns.

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See also

Oracle Database SQL Language Reference to learn more about null values

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