This book describes some interesting aspects of the weaknesses and conflictive aspects that the language SQL has in Database Processing, it includes some characteristics of the language that are valid from the perspective of the mathematical theory of Logic, but in the queries could lead us to misinterpretations of results. The intent of this book is to be used along with SQL books because it focuses specifically on the weaknesses and conflictive aspects of the language SQL. This work is an essential resource for any IT professional who works with SQL databases, because the quality of the information in a SQL database depends entirely on the quality of the database queries, for this reason is essential to know the weaknesses and conflictive aspects of the SQL language to build correct queries. It’s assumed that the reader has an intermediate knowledge of the language SQL.

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