The unexpected pleasure of reading books about databases is that they are often written by authors with highly organised minds. Paul DuBois and his editors at New Riders have assembled MySQL with a clarity and lucidity that inspires confidence in the subject matter: a (nearly) freely-re-distributable SQL-interpreting database client-server primarily geared for UNIX systems but maintained for Windows platforms as well. What isn't "free" about MySQL (the application) is its server's commercial use; all clients and non-commercial server use are free. DuBois's tome isn't free either, but its list price is modest in light of its own and its namesake's value.