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Differentiate between a subquery and a join
If we need to acquire information from one or more tables after that either subquery or join can be used. If the columns which are to appear in the result table are from different tables after that a join must be employed.
What are the uses of functional dependencies? To test relations to see whether they are legal under a given set of functional dependencies. To state constraints on the set
While sorting, if the main storage available is not enough, the system writes data to an external help file. The SAP profile parameter, which determines DIR_SORTTMP
Determine the minimal set of functional dependencies for the following data. This table is part of the OHSU database of extracurricular activities and tracks the DMICE band's co
Three way to handle missing field val
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
Can we delete data element, which is being used by table fields. No we cant delete data element.
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
Client Server Databases- The concept behind the Client/Server systems is simultaneous, cooperative processing. It is an approach that presents a one systems view from a user's vie
Relational Algebra is a set of basic operations used to influence the data in relational model. These operations allow the user to specify basic retrieval request. The result of re
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
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