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SQL definition. definition of entity database. Database entity. An database entitiy is a material or non-material structure which has its own attributes. A good example of database entity can be a simple table that contains set of some data. To show it, letâs take an example of shop database which is composed of 2 tables (entities): Sellers and Products.
Metadata means data about data. In the database world, metadata refers to the schema, the structure of the database. One significant complication is that the SQLAlchemy view of a database's structure may be different than the structure at the SQL level.Accordingly, there are three ways to use metadata to work with an SQL database.If you are working with an existing SQL database, you can ask SQLAlchemy to use reflection to determine the structure of the database, then use it as it is. MetaData instance is basically a container for Table instances that describe its constituent tables. For two different ways to call its constructor, see Section 4.1, âReflection: finding out the structure of an existing SQL databaseâ and Section 4.2, âBuilding your own schemaâ .