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One way to implement a database system on a computer is based on the concept of a relational database system. Such databases implement ideas first described by Codd and Date in the early 1970s. They took the name from a mathematical concept known as a relation, which is an ordered set of values from different domains.
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Data and programs in SQL Server are organized into logical components called database objects. Database users (administrators
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and developers) access and manage information in SQL Server by accessing and managing database objects.
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NOTE: If you have worked with or are familiar with some object-oriented programming language or methodology, let me warn you that database objects will not comply with the definitions found in such languages.
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As with any other relational database system, the most important database objects in SQL Server are tables. Data in SQL Server is organized in tables, which consist of rows and columns. You can visualize SQL Server tables by thinking of the two-dimensional tables you find in spreadsheet applications such as Microsoft Excel. Usually, a table represents entities such as persons, assets, or locations. A row in a table corresponds to one instance of an entity (for example: one person, or one asset, or one location). Each column contains an attribute that describes some aspect of the entity. For example, a person can be described with columns representing first name, last name, date of birth, phone number, and other such characteristics. The major difference between tables that comply with the relational database concept and other types of tables is that the data in a column must describe only one attribute. All values in a column must belong to only one domain of appropriate values. An ordered set of values that belong to different domains is called a relation. The collection of column definitions and other table attributes (constraints) belongs to a table definition. This information is often called metadata information data about data. There are many types of table and column attributes. Constraints are database objects used to enforce rules that values in columns must follow to be written to the database. Database designers can use them to specify default values, to point to a list of allowed values, or to specify a rule that needs to be satisfied. Datatypes are objects that specify the type of data (number, character, dates, and so on) that can be stored in a column.
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Relational Database Concepts and the SQL Server Environment
Databases
Sets of tables in SQL Server belong to databases. A database is an object that contains all other objects. It is stored physically in one or more database files, but SQL Server manages storage issues so that users do not have to be concerned with the database files themselves. Tables stored in the database can be categorized by functionality into two groups: user tables and system tables. User tables store application information information about entities that database users are interested in. System tables store metadata information such as lists of database objects, object definitions, and database security information. There are also several system databases, which contain server metadata information such as the locations of other databases, definitions of maintenance tasks, configuration parameters of the server, and server security information.
Transact-SQL Statements
RDBMS systems include special applications that enable users to issue statements to retrieve and change information concerning entities. Query Statements Most database applications allow the user to issue a query statement and view a resultset that contains the requested information, or to issue a change statement and receive a confirmation that the operation was successful. All mainstream database systems use the same standard language SQL (Structured Query Language) to describe the resultset that users want to receive from the database system. Microsoft SQL Server uses a dialect of SQL known as Transact-SQL or TSQL. All SQL dialects use the following four basic SQL statements: Select, Insert, Update, and Delete. The most important Transact-SQL statement is the Select statement. It is used to describe the resultset the user wants to retrieve from the database system. The Insert statement is used to move information into tables. The purpose of the Update statement is to change information that is already stored in tables within the database. The Delete statement is used to remove records from tables.
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