One of the important properties of a column is whether or not it can have a NULL value.

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A column can be set to allow or disallow NULL values, and this is an important property that affects how data can be stored and queried. If a column does not allow NULL values, then every record must have a valid value in that column. If a column allows NULL values, then some records may have no value in that column, which can affect queries and calculations that use that column.

One of the Important Properties of a Column Is Whether