SQL Schema and Query Quiz
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Questions and Answers

In SQL, what does the CREATE TABLE command do?

  • Specifies a new base relation by defining its name, attributes, and data types (correct)
  • Deletes an entire table and its definition from the database
  • Modifies the existing table structure by adding new columns
  • Alters the table by changing the data types of its columns
  • What is the purpose of the PRIMARY KEY phrase in the CREATE TABLE command?

  • To specify a unique constraint on a column
  • To ensure that a column does not contain any NULL values
  • To define a foreign key constraint between two tables
  • To specify the attribute(s) that uniquely identify each tuple in the table (correct)
  • What does the DROP TABLE command do in SQL?

  • Drops all the constraints associated with a table
  • Alters the table structure by removing columns
  • Deletes all the data from a table
  • Removes a relation and its definition from the database (correct)
  • What is the purpose of the UNIQUE phrase in the CREATE TABLE command?

    <p>To enforce uniqueness on a column or a combination of columns</p> Signup and view all the answers

    In SQL, what does the FOREIGN KEY phrase in the CREATE TABLE command do?

    <p>Specifies a referential integrity constraint between two tables</p> Signup and view all the answers

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