A collection of all relationships that correspond to a relational model is called a relational database. In a relational model, relationships between entities and entities are expressed in relation to each other. For example, the relationships between teachers, students, courses, lectures, and learning in example 7-2 form a database of teaching management. Therefore, a collection of all relationships that correspond to a relational model is called a relational database. The database also has the type and the value, the database type is also called the database pattern, is the database relation describing. The value of the database is the set of relationships that these relational patterns correspond to at a moment. Relationships: Data representations in relational models, consisting of relational schemas and relationship instances, which describe the columns in a relational table, and the relationship instances are the rows in the relationship. Therefore, a relationship can be thought of as a table with rows and columns.have Microsoft's old database: Mmsql also has the open source MYSQL2 kind of difference, simple Point says is: mmsql management What is more convenient, MySQL is relatively weak in the management, but the storage speed is better than mmsql
A database is an organization (or department) that is associated with a data set that is structured in a way that is determined by a data model. Database management system is a computer system software that helps users to establish, use, manage and maintain database. Or, the database management system is the platform to develop a practical application database and support its operation. The database management system must be consistent with the data model of the database it manages. 1. The data model data model is a tool for abstracting real-world data features to describe and process data and information in the real world. The data model should be able to simulate the real world on the ground, which is convenient for people to understand and to be implemented on computer. The data model consists of three parts: data structure, data operation, and integrity rules. The data structure describes the basic components of the constituent database, and the operation description describes the set of operations that are allowed to be performed on the structure, and the integrity rules describe the constraints and storage rules for the data structure.
relational database System!
