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Consider a pair of relations r(R) and s(S), and the natural join r 1 s There may be a tuple tr in r that does not join with any tuple in s That is, there is no ts in s such that tr [R S] = ts [R S] Such tuples are called dangling tuples Depending on the entity set or relationship set being modeled, dangling tuples may or may not be acceptable In Section 333, we considered a modi ed form of join the outer join to operate on relations containing dangling tuples Here, our concern is not with queries, but rather with when we should permit dangling tuples to exist in the database Suppose there is a tuple t1 in the account relation with t1 [branch-name] = Lunartown, but there is no tuple in the branch relation for the Lunartown branch This situation would be undesirable We expect the branch relation to list all bank branches Therefore, tuple t1 would refer to an account at a branch that does not exist Clearly, we would like to have an integrity constraint that prohibits dangling tuples of this sort Not all instances of dangling tuples are undesirable, however Assume that there is a tuple t2 in the branch relation with t2 [branch-name] = Mokan, but there is no tuple in the account relation for the Mokan branch In this case, a branch exists that has no accounts Although this situation is not common, it may arise when a branch is opened or is about to close Thus, we do not want to prohibit this situation The distinction between these two examples arises from two facts: The attribute branch-name in Account-schema is a foreign key referencing the primary key of Branch-schema The attribute branch-name in Branch-schema is not a foreign key (Recall from Section 313 that a foreign key is a set of attributes in a relation schema that forms a primary key for another schema) In the Lunartown example, tuple t1 in account has a value on the foreign key branch-name that does not appear in branch In the Mokan-branch example, tuple t2 in branch has a value on branch-name that does not appear in account, but branch-name is not a foreign key Thus, the distinction between our two examples of dangling tuples is the presence of a foreign key Let r1 (R1 ) and r2 (R2 ) be relations with primary keys K1 and K2 , respectively We say that a subset of R2 is a foreign key referencing K1 in relation r1 if it is required that, for every t2 in r2 , there must be a tuple t1 in r1 such that t1 [K1 ] = t2 [ ] Requirements of this form are called referential integrity constraints, or subset dependencies The latter term arises because the preceding referential-integrity constraint can be written as (r2 ) K1 (r1 ) Note that, for a referential-integrity constraint to make sense, either must be equal to K1 , or and K1 must be compatible sets of attributes. authorize.net error code 128 Code - 128 - free-barcode-generator. net
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