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Questions and Answers

What is the purpose of the SQL command 'ORDER BY'?

  • To retrieve all information from a database table
  • To query with distinction
  • To retrieve specific columns from a database table
  • To display the results in a specific order (correct)

    • What is the symbolic representation of the 'less than or equal to' operator in SQL?

  • <>
  • >
  • <= (correct)
  • >=

    • What is the SQL command to retrieve all information from a database table?

  • SELECT column_name
  • SELECT * (correct)
  • DISPLAY *
  • RETRIEVE ALL

    • What is the purpose of the SQL command 'DISTINCT'?

    <p>To remove duplicate records from the result</p> Signup and view all the answers

    What is the symbolic representation of the 'greater than' operator in SQL?

    <p>&gt;</p> Signup and view all the answers

    What is the SQL command to retrieve specific columns from a database table?

    <p>SELECT column_name</p> Signup and view all the answers

    What is the purpose of the SQL command 'WHERE'?

    <p>To query with specific records</p> Signup and view all the answers

    What is the symbolic representation of the 'equal to' operator in SQL?

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

    Study Notes

    Introduction to SQL

    • SQL stands for Structured Query Language
    • SQL is used to manage and manipulate data in relational database management systems

    Writing SQL Commands in Microsoft Access 2010

    • SQL commands can be written in Microsoft Access 2010

    SQL Basic Syntax

    • SQL syntax is used to write commands to retrieve and manipulate data
    • SQL commands can be used to retrieve all information from a database table
    • SQL commands can be used to retrieve specified columns from a database table

    Retrieving Data

    • The SELECT command is used to retrieve data from a database table
    • The SELECT command can be used to retrieve all information from a database table
    • The SELECT command can be used to retrieve specified columns from a database table

    Ordering the Result

    • The ORDER BY command is used to order the result of a query
    • The ORDER BY command can be used to order the result in ascending or descending order

    Queries with Distinction

    • The DISTINCT keyword is used to retrieve only unique values from a database table
    • The DISTINCT keyword can be used with the SELECT command to retrieve unique values

    Query with Specific Records

    • Relational operators can be used to retrieve specific records from a database table
    • Relational operators include:
      • Equal (=)
      • Greater than (&gt;)
      • Less than (&lt;)
      • Less than or equal to (&lt;=)
      • Greater than or equal to (&gt;=)

    Example Query

    • Example query: SELECT name, department FROM staff WHERE years_of_service &gt; 10;
    • This query retrieves the names and departments of staff members who have been working in the company for more than 10 years.

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    Related Documents

    、ICT SQL.pdf

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