Selection Operation in Query Processing In the previous section, we understood that estimating the cost of a query plan should be done…
Tag:
dbms architecture
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Surrogate Key in DBMS A surrogate key in DBMS is the key or can say a unique identifier that uniquely identifies an…
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Questions on Lossy and Lossless Decomposition If relation in the relational model or relational schema is not inappropriate normal form then decomposition…
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Sequential File Organization This method is the easiest method for file organization. In this method, files are stored sequentially. This method can…
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SQL Update Statement The SQL UPDATE statement is used to modify the data that is already in the database. The condition in…
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Difference between DDL and DML A database is a list of related records, and the Database Management System is the most common…
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Join Dependency Join decomposition is a further generalization of Multivalued dependencies. If the join of R1 and R2 over C is equal…
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QUESTIONS ON NORMALIZATION Question on Second Normal Form (2NF): 1. Given a relation R( A, B, C, D) and Functional Dependency set…
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Specialization Specialization is a top-down approach, and it is opposite to Generalization. In specialization, one higher level entity can be broken down…
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Views in SQL Views in SQL are considered as a virtual table. A view also contains rows and columns. To create the…