When working with databases in Python, are you writing code like this? sql = "SELECT * FROM users WHERE id = %s" % user_id ...

Before you jump into the calculation exercises, let's begin by connecting to our database. Recall that in the last chapter you connected to a PostgreSQL database. Now, you'll connect to a MySQL ...

Often, you'll need to perform math operations as part of a query, such as if you wanted to calculate the change in population from 2000 to 2008. For math operations on numbers, the operators in ...