Record
Record
A record database is all the information dealing with one particular subject.
A developer of a relational database refers to a single row of data as a "record." This record contains all the information related to a specific entity or object in the database.
In a database, a "record" is a collection of fields and all records in a "flat" databse are the same size and name, but with different data. In a relational database, a field can be a key to another table of records. A field is one data item, an index (or Key), a date, a name, etc. A record: Index,Name,Date,Acount A field: Name
A database object is represented as one of the following: database, schema, table, column, primary key, and foreign key A database Entity is: An entity is a thing or object of importance about which data must be captured. All things aren't entities - only those about which information should be captured. Information about an entity is captured in the form of attributes and/or relationships. If something is a candidate for being an entity and it has no attributes or relationships, it isn't an entity. Database entities appear in a data model as a box with a title. The title is the name of the entity.
When you create a database, you define its structure by assigning names and data types to all the fields. This process involves specifying the tables, fields, and relationships between them to organize and store data efficiently. By defining the database schema, you establish the blueprint for how data will be stored and accessed within the database.
Any computer based database is composed of certain things in a certain order. The simplest part of a database is the field. Fields can contain pictures or text or sounds or instructions on what to do with other information in other fields. Fields are grouped into Records. Records are the total of all the information on a particular person or item. Records can be combined with other records then to build the database
Structure
Record
A database schema describes the overall logical structure and relationship of data within the database. Such a schema will include all joins within the database and describe the relational sets. It is best thought of as a written description in formal terms describing the entities/tables, their attributes and the relations between individual tables in terms of primary (local) keys, foreign keys. A primary key is the attribute (or set of attributes) whose value(s) is unique within an individual entity/table to access all data in a single record. A foreign key, is a key from another table/entity that is used to join an entity/table with another entity/table, so that all data records related to the primary key can be displayed.
A centralised database is a single database under the control of a single Database Management System. All users and client applications connect directly to the DBMS. This means that the database is stored in only one location and everyone in the system is directly connected to it. Unlike a distributeddatabase which is a set of connected databases stored on multiple computers that appears to users as a single database.
lets understand them all: 1.An Entity is a real world "thing" which have independent existence. 2.Entity type is a category. 3.entity type is strictly calling, "an instance of entity type". 4.An entity type defines a collection of entities that have the same attributes. 5.Entity set : the collection of all entities of a particular entity type in the database at any point of time is called Entity set.