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Define NULL value
NULL value NULL means something is unknown. It does NOT mean null (the digit 0). Null is as well employed as attribute value for a particular entity in which attribute is not applicable for example name of child for unmarried.
sir, could anybody help me in getting complete information about the mentioned topic
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
#questiontypes of keys examples..
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