I was just searching the pagelink table and couldn't find the title I was looking for. Eventually I realized my problem was the title I was searching for had a space in it, which I needed to transform into an underscore. This isn't the first time I've made that error, and I assume others have as well.

It would be a really neat feature if Quarry knew which table fields need this space->underscore transformation and could issue a warning when you tried to search for a string with an embedded space.