Written by an SQL master, this book includes tips and techniques and also conveys the way you need to think in order to get the most out of SQL programming efforts for both correctness and performance. It features examples and update to SQL-99, includes sections of Query techniques, and a section on scheme design, with a war-story teaching style.
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The concept of Trees and Hierarchy is very important in SQL. These are necessary to understand to sharpen your skills. I really like the tips and techniques given in this book to understand these terms.
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