SQL Basic Query Structure and Operations Quiz
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Questions and Answers

What is the purpose of the SQL data-manipulation language (DML)?

  • To manage user access and permissions
  • To query information and manipulate data (correct)
  • To create databases and tables
  • To optimize database performance

    • What does the 'select' clause in SQL do?

  • Create a new table based on the query results
  • Specify the tables to be queried
  • List the attributes desired in the result of a query (correct)
  • Define the conditions for the query

    • What does the 'alter table' statement do in SQL?

  • Deletes all contents of a table
  • Optimizes the performance of a table
  • Adds a new attribute to a relation (correct)
  • Drops an attribute from a relation

    • What is the result of an SQL query?

    <p>A relation</p> Signup and view all the answers

    What is the purpose of the SQL 'drop table' statement?

    <p>Deletes the table and its contents</p> Signup and view all the answers

    SQL allows duplicates in relations as well as in query results.

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

    The 'delete from' statement in SQL deletes the table and its contents.

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

    The 'alter table' statement in SQL can be used to add a new attribute to a relation.

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

    The select clause in SQL corresponds to the selection operation of the relational algebra.

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

    SQL names are case sensitive, meaning you cannot use upper- or lower-case letters interchangeably.

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

    SQL allows duplicates in relations as well as in query results.

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

    The 'alter table' statement in SQL can be used to add a new attribute to a relation.

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

    The select clause in SQL corresponds to the projection operation of the relational algebra.

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

    SQL names are case sensitive, meaning you cannot use upper- or lower-case letters interchangeably.

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

    The 'delete from' statement in SQL deletes all contents of the table, but retains the table.

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

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