What does the OR operator do in a SQL query?

The temperature of a 500. mL sample of gas increases from 150. K to 350. K. What is the final volume of the sample of gas, if the pressure and amount of gas in the container are kept constant? 

How many grams of Fe2O3  are there in 0.500 moles of Fe2O3? (molar mass of Fe2O3 = 159.69 g)

What does the IN operator do in a SQL query?

In a relational database, data are stored in:

Given table SHIP, write an SQL query to calculate the length of the longest ship of each type.

Why might a designer choose to define a composite primary key in a table?

You want to show the total cargo weight shipped by each ship. Which query gives each ship name and the total cargo weight it carried?

Why is data typically stored across multiple tables in a relational database?

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.