Transforming Relational Expressions The first step of the optimizer says to implement such expressions that are logically equivalent to the given expression.…
Tag:
dbms keys
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Hash Join Algorithm The Hash Join algorithm is used to perform the natural join or equi join operations. The concept behind the…
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Primary Key in DBMS There are certain keys in DBMS that are used for different purposes, from which the most commonly known…
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Normalization A large database defined as a single relation may result in data duplication. This repetition of data may result in: Making…
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Relational Model concept Relational model can represent as a table with columns and rows. Each row is known as a tuple. Each…
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SQL SELECT Statement In SQL, the SELECT statement is used to query or retrieve data from a table in the database. The…
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Nested-Loop Join Algorithm In our previous section, we learned about joins and various types of joins. In this section, we will know…
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Problems with ER Model This article will study the two main types of connection traps and how to solve such problems in…
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Notation of ER diagram Database can be represented using the notations. In ER diagram, many notations are used to express the cardinality.…
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Relationship of higher degree The degree of relationship can be defined as the number of occurrences in one entity that is associated…