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Determine the rule that a value of a foreign key should appear as a value of some particular table is called a Ans: Referential constraint. The rule that a value of a fo
comparison of oracle RDBMS with MySQL
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
What are the three types of data sources used with ODBC? An ODBC file data source is a file that can be shared between database users. An ODBC system data source is one that is
To do the division operation R1 ÷ R2, R2 should be a correct subset of R1. In the following example R1 have attributes A and B and R2 have only attribute B so R2 is a correct subse
How external/conceptual mapping and conceptual /internal mapping is performed
What are the two types of errors? The two types of errors are: a) Logical error b) System error
What are the storage types? The storage types are: a) Volatile storage b) Nonvolatile storage
Explain trigger? Trigger: A database trigger is procedural code which is automatically executed within response to certain events on a particular table in a database. Trigger
Design a gennalization and specialization hierarchy for an automobile sales company
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