What is stored procedure in SQL server interview questions?

What is stored procedure in SQL server interview questions?

The group of SQL statements which are or have been stored in the server database is known as a stored procedure. Input parameters are accepted in the stored procedures so that several clients can use that single procedure over the network using that single input data.

What is stored procedure in SQL server with example?

What is a Stored Procedure? A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again. So if you have an SQL query that you write over and over again, save it as a stored procedure, and then just call it to execute it.

Why stored procedures are faster?

Stored procedures are precompiled and optimised, which means that the query engine can execute them more rapidly. By contrast, queries in code must be parsed, compiled, and optimised at runtime.

How do I merge two stored procedures?

  1. Declare one table variable for Stored Procedure 1.
  2. Declare another table variable for Stored Procedure 2.
  3. Declare third table variable which consists of all columns, table1 and table2 and use UNION to populate it as:

What is the difference between query and stored procedure?

What is the difference between a query and stored procedure? query and stored procedure do the same thing but the difference is that a query should be compiled everytime the query is executed,while the stored procedure is in compiled form when executed first time.

How do I speed up a stored procedure?

  1. Specify column names instead of using * in SELECT statement. Try to avoid *
  2. Avoid temp temporary table. Temporary tables usually increase a query’s complexity.
  3. Create Proper Index. Proper indexing will improve the speed of the operations in the database.
  4. Use Join query instead of sub-query and co-related subquery.

What is the advantage of stored procedure?

To help you build powerful database applications, stored procedures provide several advantages including better performance, higher productivity, ease of use, and increased scalability.

Do stored procedure run faster?

Because of this, the stored procedure may in fact be executing faster because it was able to reuse a cached plan. But this is not a fair comparison – if both plans would pull from the cache, or if both plans had to generate new execution plans, they would both have the same execution performance.

What is symbol in stored procedure?

The @variable syntax in MySQL denotes a user-defined session variable. You can set these user variables outside a stored procedure, but you can also set them inside a stored procedure, and the effect is that the variable retains the value after your procedure call returns.

What are the disadvantages of stored procedures?

Drawbacks of Stored Procedures

  • Testability. First and foremost business logic which is encapsulated in stored procedures becomes very difficult to test (if tested at all).
  • Debugging.
  • Versioning.
  • History.
  • Branching.
  • Runtime Validation.
  • Maintainability.
  • Fear of change.