SQL Transaction Management
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SQL Transaction Management

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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

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    Quiz Team

    Description

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

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