Database Table Design Rules
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Questions and Answers

Which SQL command is used for data retrieval?

  • SELECT (correct)
  • INSERT
  • ADD
  • UPDATE

    • How are tables perceived in a relational database?

  • As a collection of columns
  • As a collection of rows (correct)
  • As a collection of records
  • As a collection of files

    • What SQL statement is used to create empty tables?

  • DEFINE TABLE
  • ENTER TABLE
  • ADD TABLE
  • CREATE TABLE (correct)

    • In interactive SQL, what happens when you type a command to ask the database a question?

    <p>The database shows you the answer right away</p> Signup and view all the answers

    Which term is used in SQL to describe the desired column features in retrieved data?

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

    When constructing empty tables, when is data entered?

    <p>Data is entered after using INSERT statement</p> Signup and view all the answers

    What is the main purpose of a primary key in a database table?

    <p>To uniquely identify all table records</p> Signup and view all the answers

    Which SQL operation is used to retrieve data from a database table?

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

    What happens when a primary key column contains null values?

    <p>It violates the primary key constraint</p> Signup and view all the answers

    What defines a composite key in a database table?

    <p>It consists of more than one column</p> Signup and view all the answers

    Which SQL command is used to add a new row into a table?

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

    What is the range of values for the SMALLINT data type in SQL?

    <p>-32768 to 32767</p> Signup and view all the answers

    What operation in SQL allows you to select data from two or more tables?

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

    In a CROSS JOIN operation in SQL, what is the result?

    <p>Producing the Cartesian product of the tables</p> Signup and view all the answers

    What does an INNER JOIN in SQL do?

    <p>Combine tables based on a common column.</p> Signup and view all the answers

    What is the purpose of a RIGHT OUTER JOIN in SQL?

    <p>Retrieve all records from the right table and matching records from the left table.</p> Signup and view all the answers

    What does a SELF JOIN in SQL involve?

    <p>Joining a table to itself.</p> Signup and view all the answers

    Which SQL operation is used to handle database queries, updates, and maintenance?

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

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