What must be true of a column or column combination before it can serve as a primary key in SQL?

What does the asterisk (*) symbolize when it is used right after SELECT?

You want to create a list of ship names and their destination ports for voyages that went to ‘Singapore’. You use a CTE to define the voyages first. Which query gives the correct result?

Given table SHIP, write an SQL query to find the ship types that have an minimum length less than 200, along with the count of ships for those types.

In relational database terminology, what is the term ‘column’ most commonly used to describe?

In SQL, what does the SELECT statement do?

A mixture is prepared by dissolving 2 g of KCl in 100 g of H2O. In this mixture, H2O is the 

What is the in a solution with = 1 × 10-12 M? (Kw = 1.0 x 10-14)

 A potato contains 20 g of carbohydrate. If carbohydrate has a caloric value of 4 kcal/g, how many kcal are obtained from the carbohydrate in the potato?

How many significant figures are in the number 1.00208?