SQL Transaction Management
10 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is a requirement for creating a function in SQL Server?

  • The function name must begin with a special character
  • The function must return a specific data type
  • The function must have a minimum of two input parameters
  • The function name cannot begin with a special character (correct)

    • What is the only type of statement that can operate with functions in SQL Server?

  • INSERT statements
  • UPDATE statements
  • DELETE statements
  • SELECT statements (correct)

    • What happens when a function is called in SQL Server?

  • It is executed
  • It is compiled (correct)
  • It is interpreted
  • It is optimized

    • What is a requirement for functions in SQL Server?

    <p>They must return a value or result</p> Signup and view all the answers

    What type of functions are defined by the system in SQL Server?

    <p>System functions</p> Signup and view all the answers

    What is an example of a built-in string function in SQL Server?

    <p>SUBSTRING</p> Signup and view all the answers

    What is a characteristic of user-defined functions in SQL Server?

    <p>They are user-created</p> Signup and view all the answers

    What type of function can be used to calculate values and manipulate data in SQL Server?

    <p>System function</p> Signup and view all the answers

    What statement cannot be used in functions in SQL Server?

    <p>CATCH statement</p> Signup and view all the answers

    What is a benefit of using built-in functions in SQL Server?

    <p>They save time while performing specific tasks</p> Signup and view all the answers

    Study Notes

    Transaction Control

    • Successful statements are committed, while failed statements are rolled back
    • Implicit Transaction Mode: each DML statement is automatically committed or rolled back
    • Explicit Transaction Mode: allows defining the beginning and end points of a transaction

    Transaction Control Commands

    • BEGIN TRANSACTION: indicates the start of a transaction
    • COMMIT: saves changes permanently to the database
    • ROLLBACK: cancels modifications and reverts to the previous state
    • SAVEPOINT: creates a point in a transaction that can be rolled back to
    • RELEASE SAVEPOINT: removes a savepoint
    • SET TRANSACTION: gives a transaction a name and defines its properties

    Auto Rollback Transaction

    • If an error occurs during a transaction, no modifications are made to the database
    • Remaining statements in the transaction are not executed

    Triggers

    • Special type of stored procedure that runs automatically in response to an event
    • Types of triggers:
      • DDL triggers: respond to DDL events (CREATE, ALTER, DROP)
      • DML triggers: respond to DML events (INSERT, UPDATE, DELETE)
      • Logon triggers: respond to logon events

    Advantages of Triggers

    • Protect data integrity
    • Enforce referential integrity
    • Keep tables in sync
    • Useful for event logging and auditing

    Stored Procedures

    • Combination of SQL statements that perform a specific task
    • Advantages:
      • Code reusability
      • Faster execution
      • Reduces network traffic
      • Improves data security
      • Easy to maintain

    Stored Procedure Syntax

    • CREATE PROCEDURE procedure_name AS BEGIN sql_statement END
    • Parameters are added as comma-separated arguments after the procedure name

    Functions

    • Database objects that contain a set of SQL statements to perform a specific task
    • Functions always return a single value or a table
    • Rules for creating functions:
      • Must have a name that doesn't start with a special character
      • Can only use SELECT statements
      • Must return a value
      • Can only use input parameters
      • Cannot use TRY and CATCH statements

    Types of Functions

    • System Functions: built-in functions supported by the server (e.g. AVG, COUNT, SUM, MIN, DATE)
    • User-Defined Functions: created by the user to perform a specific task

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    This quiz covers different SQL transaction modes, including auto-commit, implicit and explicit transaction modes, and their uses in database management.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser