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SQL Server 2000 Stored Procedure Programming
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The following statement will list all records in the Customers table:
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select * from Customers
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The major difference between statements in Transact-SQL and those in other programming languages is that Transact-SQL statements describe what needs to be displayed (retrieved) or changed, but not how to do it. Thus, Transact SQL is known as a nonprocedural language. DDL Statements Transact-SQL also contains a huge set of statements designed to create and manage database objects and other metadata information. This subset of statements is often referred to as the Data Definition Language (DDL). The following statement will create a Customers table that contains six columns:
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Create table Customers (CustomerId int, CustomerName varchar(50), Address varchar(50), City varchar(50), Phone varchar(50), Fax varchar(50))
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Each column definition also indicates the type of data the column will store. Groups of Statements Transact-SQL statements are usually issued in groups. A script is a set of SQL statements organized into a file. Scripts are generally created to run complex or repetitive operations such as the creation of a report, the transfer of funds from one account to another, or some database maintenance activity. A user may wish to write such a set of statements to a file for later reuse. A batch is a group of one or more Transact-SQL statements that is sent to the server simultaneously. When the server receives a batch, it parses it, compiles it into an execution plan, and finally executes it.
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Transact-SQL Statements Organized in Database Objects Transact-SQL statements can also be grouped and stored in the database. Views are database objects that behave like virtual tables. They are implemented as stored Select statements. A stored procedure is a database object designed to store, for later use, a group of Transact-SQL statements that describes how some operation should be carried out. Database users (administrators and developers) can create user-defined stored procedures. SQL Server is delivered with a set of system-stored procedures, which cover all aspects of managing data, objects, and the server. A trigger is a special type of procedure attached to tables and executed when a predefined change is performed on the table. A function is a database object that returns a single value. Some functions are implemented as a set of Transact-SQL statements, and others are implemented as built-in functions for returning a particular value to the caller.
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Many other objects are also treated as database objects. Logins are account identifiers that allow users to be recognized by SQL Server. After users are identified, SQL Server allows them access to the databases they are authorized to use. Their logins must be recognized as users (another object) in those databases. Developers can create diagrams of tables stored in a database. Administrators can create jobs that are going to perform some business or maintenance operation at a scheduled time or on demand.
Client/Server Architecture
Database users often work with specialized applications to view and modify the data in a database. Such applications are often called client applications, client tools, front-end applications, or database applications. All of these terms are descriptive of the architecture of such a system.
SQL Server 2000 Stored Procedure Programming
A client/server system consists of two or more programs or systems that interact to provide a user with required information or help a user to perform some action. The client application makes a request, and the server program fulfills the request:
In the SQL Server environment, requests take the form of Transact-SQL statements. SQL Server processes them and returns a resultset to the client application with the required information or just a confirmation that the action was performed successfully. Many client applications or users can make requests concurrently, and SQL Server is capable of processing them in parallel. A client application can offer a different level of comfort to a user. The simplest tools (but not the easiest to use) allow a user to enter a request in the form of a Transact-SQL statement and receive
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