Author: Awais Farooq
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Data Integrity
SQL databases enforce data integrity by enforcing constraints such as unique keys, primary keys, and foreign keys, which help prevent data duplication and maintain data accuracy.
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Security
SQL databases have built-in security features that help protect data from unauthorized access, such as user authentication, encryption, and access control.
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Scalability
SQL databases can handle large volumes of data and can be scaled up or down as per the requirements of the application.
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Interactive Language –
Easy to learn and understand, answers to complex queries can be received in seconds.
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Portable –
It can be used in programs in PCs, server, laptops independent of any platform (Operating System, etc). Also, it can be embedded with other applications as per need/requirement/use.
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Standardized Language –
Due to documentation and long establishment over years, it provides a uniform platform worldwide to all its users.
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No Coding Skills –
For data retrieval, large number of lines of code is not required. All basic keywords such as SELECT, INSERT INTO, UPDATE, etc are used and also the syntactical rules are not complex in SQL, which makes it a user-friendly language.
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Faster Query Processing –
Large amount of data is retrieved quickly and efficiently. Operations like Insertion, deletion, manipulation of data is also done in almost no time.
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Alternate Key in SQL
Alternate key is a secondary key it can be simple to understand by an example: Let’s take an example of student it can contain NAME, ROLL NO., ID and CLASS. Here ROLL NO. is primary key and rest of all columns like NAME, ID and CLASS are alternate keys. If a table has more than…
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Unique Key in SQL
A unique key is a set of one or more than one fields/columns of a table that uniquely identify a record in a database table. You can say that it is little like primary key but it can accept only one null value and it cannot have duplicate values. The unique key and primary key…