10 Questions
Which statement is true about using SELECT * in SQL queries?
It queries all available data from a table
Why is it recommended to use the SELECT statement instead of SELECT * in SQL queries?
It saves database resources by querying only the necessary data
Which of the following is an example of an inefficient SQL query?
SELECT * 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
To keep an index of all tables and field names, which system table can be queried?
INFORMATION_SCHEMA
Which statement is true about using SELECT * in SQL queries?
SELECT * queries all available data from a table
What is the purpose of using the SELECT statement in SQL queries?
To query specific fields from a table
Which of the following is an example of an inefficient SQL query?
SELECT * FROM Customers
What additional information may be retrieved by the inefficient SQL query SELECT * FROM Customers?
All of the above
To keep an index of all tables and field names, which system table can be queried?
INFORMATION_SCHEMA
Test your SQL knowledge with this quiz on using SELECT statements effectively. Learn why it's important to avoid using SELECT * and how it impacts database performance.
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