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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?

Mailing addresses of customers Signup and view all the answers

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

INFORMATION_SCHEMA Signup and view all the answers

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

SELECT * queries all available data from a table Signup and view all the answers

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

To query specific fields from a table Signup and view all the answers

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

SELECT * FROM Customers Signup and view all the answers

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

All of the above Signup and view all the answers

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

INFORMATION_SCHEMA Signup and view all the answers

Mastering SELECT Statements

Choose a study mode

Podcast

Questions and Answers

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

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

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

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

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

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

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

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

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

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

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