Blog

What does COUNT(*) return when used in a SELECT statement without a WHERE clause?

When you have a complex SQL query that involves several steps, what is the recommended approach to solve it?

You want to list the names of all owners who currently own at least one ship. You use a CTE to define the list of owned ships first. Which query gives the correct result?

How is a one-to-many relationship physically represented in a relational schema?

Why is a scalar subquery useful in an SQL expression?

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

Oil does not dissolve in water because ________. 

The neutralization reaction between Al(OH)3  and HNO3  produces the salt with the formula ________.

What is the [H3O+] in a solution with [ OH-] = 1 × 10-12 M? (Kw = 1.0 x 10-14)

How many moles of neon occupy a volume of 14.3 L at STP? (1 mol of gas at STP = 22.4 L)