SQL Server Express Database Management

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Questions and Answers

Which data type should you use for a column that will store text up to 255 characters?

  • VARCHAR(255) (correct)
  • TEXT
  • STRING(255)
  • CHAR(255)

Which SQL clause is used to filter records returned by a SELECT statement?

  • GROUP BY
  • WHERE (correct)
  • ORDER BY
  • FILTER BY

What is the purpose of the SQL SELECT keyword?

  • To select which database to use
  • To retrieve data from a database (correct)
  • To update existing records
  • To delete records

Which SQL command can be used to modify the structure of an existing table?

<p>ALTER TABLE (A)</p> Signup and view all the answers

What is the keyword for sorting records in ascending order?

<p>ASC (B)</p> Signup and view all the answers

Which SQL statement is used to add new records to a table?

<p>INSERT INTO (C)</p> Signup and view all the answers

How would you specify that a certain column in a table does not accept NULL values?

<p>NOT NULL (A)</p> Signup and view all the answers

Which function is used to return the number of records in a result set?

<p>COUNT() (C)</p> Signup and view all the answers

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Study Notes

Working with Databases and SQL Server Express

Selecting a Database

  • The USE keyword is used to select the database you want to work with.

Creating a Table

  • The correct syntax to create a table named students with three VARCHAR columns named firstName, lastName, and studentID is: CREATE TABLE students (firstName VARCHAR(25), lastName VARCHAR(25), studentID VARCHAR(10));

Sorting Database Records

  • The DESC keyword is used to perform a reverse sort of database records.

Filtering Records

  • The correct string for a filter that narrows a recordset to include only records where the State field is equal to California is: "WHERE State = 'California'"
  • The WHERE clause is used to specify a condition for which records to include in a result set.

Updating Records

  • The SET keyword is used in an UPDATE statement to change the value of a matching column.

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