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Machine Learning. Data Structures. Operating System. Computer Network. Compiler Design. Computer Organization. Discrete Mathematics. Ethical Hacking. Computer Graphics. Software Engineering. The structure for a database is arrived at by properly organizing the data with the help of a database model. Technically speaking, a database schema is the underlying structure described by and supported by the database management system that is used to store records.
Generally, a schema is a higher level of abstraction of the design models which are captured and documented by database designers and business analysts during the analysis phase of a project or product development. They do not exist as such in a database, but in some variants of databases they can be realized at some levels in a physical form. When we bring a user into this perspective, then we can define these three entities database, schema, and user as below:. A database is a collection of related records and data stored in tables.
A schema, on the other hand, is a logical definition of the database or, in other words, a blueprint that defines the names of all the tables and columns and defines what type each column is, etc.
In some database management systems, a schema can be realized in a physical form at any of the levels. This isn't correct for SQL Server specifically; Tables have schemas in general databases yes, but Schemas for who knows what reason in SQL Server are also effectively namespaces that contain tables and those tables also have schemas in the traditional sense.
Unfortunate name that Microsoft picked for them - namespace is far more appropriate. Robert Robert 3, 1 1 gold badge 14 14 silver badges 25 25 bronze badges. Hardik Mishra Hardik Mishra Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end. Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. But, a database is an organized collection of data stored and accessed electronically from a computer system.
A schema contains table names, attributes fields and their types and constraints. In other words, a database contains schema, data, database objects such as tables and indexes. Furthermore, DDL commands helps to modify the schema structure while DML commands help to modify the data in the database.
In brief, a database is a collection of physical files. On the other hand, a schema is a logical structure of a database. The main difference between schema and database is that schema is a logical definition of a database that defines the tables, columns and types of columns while the database is a collection of related data stored in tables.
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