Use proper indentation for the statements in SQL Server. It will improve the readability. Write the proper comments between the logics. So the others can understand quickly.
Comparison with static SQL[ edit ] Overhead Because stored procedure statements are stored directly in the database, they may remove all or part of the compiling overhead that is typically needed in situations where software applications send inline dynamic SQL queries to a database.
However, most database systems implement statement caches and other methods to avoid repetitively compiling dynamic SQL statements. Also, while they avoid some pre-compiled SQL, statements add to the complexity of creating an optimal execution plan because not all arguments of the SQL statement are supplied at compile time.
Depending on the specific database implementation and configuration, mixed performance results will be seen from stored procedures versus generic queries or user defined functions. Avoiding network traffic A major advantage of stored procedures is that they can run directly within the database engine.
In a production system, this typically means that the procedures run entirely on a specialized database server, which has direct access to the data being accessed.
The benefit here is that network communication costs can be avoided completely. This becomes more important for complex series of SQL statements.
Encapsulating business logic Stored procedures allow programmers to embed business logic as an API in the database, which can simplify data management and reduce the need to encode the logic elsewhere in client programs.
This can result in a lesser likelihood of data corruption by faulty client programs. The database system can ensure data integrity and consistency with the help of stored procedures. Delegating access-rights In many systems, stored procedures can be granted access rights to the database that users who execute those procedures do not directly have.
Some protection from SQL injection attacks Stored procedures can be used to protect against injection attacks. Stored procedure parameters will be treated as data even if an attacker inserts SQL commands.
Also, some DBMS will check the parameter's type. However, a stored procedure that in turn generates dynamic SQL using the input is still vulnerable to SQL injections unless proper precautions are taken.
Other uses[ edit ] In some systems, stored procedures can be used to control transaction management; in others, stored procedures run inside a transaction such that transactions are effectively transparent to them.
Stored procedures can also be invoked from a database trigger or a condition handler. For example, a stored procedure may be triggered by an insert on a specific table, or update of a specific field in a table, and the code inside the stored procedure would be executed.
Writing stored procedures as condition handlers also allows database administrators to track errors in the system with greater detail by using stored procedures to catch the errors and record some audit information in the database or an external resource like a file.
Comparison with functions[ edit ] A function is a subprogram written to perform certain computations. A scalar function returns only one value or NULLwhereas a table function returns a relational table comprising zero or more rows, each row with one or more columns.
A stored procedure can return multiple values using the OUT parameter, or return no value. A stored procedure saves the query compiling time. A stored procedure is a database object.
A stored procedure is a material object. Comparison with prepared statements[ edit ] Prepared statements take an ordinary statement or query and parameterize it so that different literal values can be used at a later time.
Like stored procedures, they are stored on the server for efficiency and provide some protection from SQL injection attacks.
Although simpler and more declarative, prepared statements are not ordinarily written to use procedural logic and cannot operate on variables. Because of their simple interface and client-side implementations, prepared statements are more widely reusable between DBMS. Stored procedure languages are often vendor-specific.
Changing database vendors usually requires rewriting existing stored procedures. Stored procedure languages from different vendors have different levels of sophistication.
Changes to stored procedures are harder to keep track of within a version control system than other code. Changes must be reproduced as scripts to be stored in the project history to be included, and differences in procedures can be harder to merge and track correctly.This is my SQL Server Stored Procedure which is below: CREATE PROCEDURE passenger_details AS BEGIN SELECT Full_Name, Age, Nationality, Category, Airline_Name, Class_Type FROM Passenger, Ticket, Ai.
Managing Permissions with Stored Procedures in SQL Server. 03/30/; 3 minutes to read Contributors. all; In this article. One method of creating multiple lines of defense around your database is to implement all data access using stored procedures or user-defined functions.
Learn the basics of writing stored procedures, monitor stored procedure activity using the Profiler utility, and learn from several real-world stored procedure programming issues. Ken Henderson also touches on many of the nuances and quirks in Transact-SQL, and how to use them to your advantage and.
In a recent tip (Accessing the Windows File System from SQL Server) options were outlined to capture files from a specific directory into a temporary table or table variable for additional processing.
A similar file operations task that is needed in part. Jun 18, · how to write a stored procedure for update in sql server in a employee table. i have emp_id as primary key the condtion i have is w hile r updating if OnlineID already exists, then you should not allow the data to be updated.
May 31, · Microsoft® SQL Server™ is a relational database management and analysis system for e-commerce, line-of-business, and data warehousing solutions.