How do you get past the crushing boredom of reading an O'Reilly book?

Currently reading SQL for Data Analysis by Cathy Tanimura. Reading about half an hour a day during my workday. I'm about halfway through but I can feel my eyes starting to glaze over. Do I just push through it? Should I only keep it on the shelf as a reference manual? Move on to something else and come back to it on an as-needed basis?

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