Mastering SELECT Statements
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Questions and Answers

Which statement is true about using SELECT * in SQL queries?

  • It is a shorthand for querying specific fields
  • It is more efficient than using the SELECT statement
  • It queries only the necessary data from a table
  • It queries all available data from a table (correct)

Why is it recommended to use the SELECT statement instead of SELECT * in SQL queries?

  • It is easier to write and understand
  • It is a best practice in SQL development
  • It allows for faster query execution
  • It saves database resources by querying only the necessary data (correct)

Which of the following is an example of an inefficient SQL query?

  • SELECT ProductName, Price FROM Products
  • SELECT * FROM Orders
  • SELECT * FROM Customers (correct)
  • SELECT FirstName, LastName, Address, City, State, Zip FROM Customers

What kind of information does the efficient SQL query SELECT FirstName, LastName, Address, City, State, Zip FROM Customers retrieve?

<p>Mailing addresses of customers (C)</p> Signup and view all the answers

To keep an index of all tables and field names, which system table can be queried?

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

Which statement is true about using SELECT * in SQL queries?

<p>SELECT * queries all available data from a table (B)</p> Signup and view all the answers

What is the purpose of using the SELECT statement in SQL queries?

<p>To query specific fields from a table (C)</p> Signup and view all the answers

Which of the following is an example of an inefficient SQL query?

<p>SELECT * FROM Customers (C)</p> Signup and view all the answers

What additional information may be retrieved by the inefficient SQL query SELECT * FROM Customers?

<p>All of the above (D)</p> Signup and view all the answers

To keep an index of all tables and field names, which system table can be queried?

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

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