名词解释题关系（Relation）
名词解释题
关系（Relation）
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●For relation where primary key contains multiple attributes，no non-key attribute should be functionally dependent on a part of primary key．This relation R is at least in (66) .(66) A．3NFB．2NFC．INFD．BCNF
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Let R and S be the relation respectively: Relation R:A B C Relation S:B C D 1 2 3 2 3 4 6 7 8 2 3 5 9 7 8 7 8 1 The number of tuples that the result of the expression R ∞ S( Here is the natural join of relations R and S)is(69).A．1B．4C．7D．10
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For relation where primary key contains multiple attributes, no non-key attribute should be functionally dependent on a part of primary key. This relation R is at least in(66).A．3NFB．2NFC．INFD．BCNF
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Where can you add your own PL/SQL code in relation-handling triggers?（）A、Before the "End default relation program section" comment. B、After the "Begin default relation program section" comment. C、Before the "Begin default relation program section" comment. D、It is not possible to modify the relation-handling code that Forms automatically creates for relations.
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单选题Where can you add your own PL/SQL code in relation-handling triggers?（）ABefore the End default relation program section comment. BAfter the Begin default relation program section comment. CBefore the Begin default relation program section comment. DIt is not possible to modify the relation-handling code that Forms automatically creates for relations.
单选题You want to implement a master-detail relation between data blocks based on object tables. How would you do this? （）ACreate the relation manually and coordinate the blocks using triggers. BBase the relation on a REF pointer using the Data Block Wizard. CBase the relation on a foreign key using the Data Block Wizard. DThis task is not possible because master-detail relations can be implemented only for blocks based on relation tables.
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