define null values in some cases a particular
Define null values.
In some cases a particular entity might not have an applicable value for an attribute or if we do not know the value of an attribute for a particular entity. In these cases null value is used.
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define single valued and multivalued attributes single valued attributes attributes with a single value for a particular entity are known as
sam tyler a single taxpayer social security number 111-44-1111 bought rental equipment on 04012010 he paid 400000 including all closing and delivery
the fancy new french restaurant la food is very popular for its authentic cuisine and high prices this restaurant does not take reservations to help
what are stored and derived attributes stored attributes the attributes kept in a data base are called stored attributes derived attributes the
define null values in some cases a particular entity might not have an applicable value for an attribute or if we do not know the value of an
define the terms i key attribute ii value set key attribute an entity type usually has an
define weak and strong entity sets weak entity set entity set that do not have key attribute of their
explain the two types of participation constraint total the participation of an entity set e in a relationship set r is said to be total if each
define the terms i ddl ii dml ddl data base schema is specified by a set of definitions expressed by a special
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