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Attribute Preservation This is a easy and obvious necessity that includes preserving all the attributes that were there in the relation that is being decomposed.
What is a value? A data value is used for identity. This form of identity is used in relational systems.eg: The primary key value of a tuple recognize the tuple.
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
To eliminate duplicate rows (distinct operator) Example: SELECT DISTINCT DEPTNO FROM EMP;
explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks
A relation has: Relational Schema Relation instance Relational Schema: A relational schema shows the relation's name, its attributes and the domain of every a
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
A database to track your progress in your college program will track your progress towards graduation! A database that has information containing the classes that you have taken, c
When a function module is activated syntax checking is performed automatically. YEs, a function module is activated syntax checking.
Drawbacks of Data Distribution: The primary drawbacks of distributed database systems are the added complexity needed to ensure proper coordination between the sites. This increas
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