When we do not have a value to add to a column, we can set a DEFAULT constraint that will fill it in for us.

If we're just building a playlist, surely we haven't played the song yet!

Great! So we're adding a new column that accepts the data type BOOLEAN to our table.

If we don't specify whether or not we've played a song, it will automatically be filled in as true.

Nope. We want to set a default value!