Referential Integrity constraint A referential integrity constraint is also known as foreign key constraint. A foreign key is a key whose values…
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advantage
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Storage System in DBMS A database system provides an ultimate view of the stored data. However, data in the form of bits,…
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Transforming Relational Expressions The first step of the optimizer says to implement such expressions that are logically equivalent to the given expression.…
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Selection of RAID Levels In the previous section, we came to know about RAID and understood the various levels of RAID. Here,…
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Super Key in DBMS We can define a super key as a set of those keys that identify a row or a…
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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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Selection Operation in Query Processing In the previous section, we understood that estimating the cost of a query plan should be done…
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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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Decomposition Algorithms In the previous section, we discussed decomposition and its types with the help of small examples. In the actual world,…
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Denormalization in Databases When we normalize tables, we break them into multiple smaller tables. So when we want to retrieve data from…