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That means they should be updatable, just as "real" or base tables are.
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In stark contrast to this conventional wisdom, this book shows how views, just like base tables, can always be updated (so long as the updates don’t violate any integrity constraints).
In fact, view updatability isn’t just desirable, it’s crucial, for practical reasons as well as theoretical ones.
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SQL and Relational Theory: How to Write Accurate SQL Code By C. Date Publisher: O"Re.Me..dia; Second edition 2011 | 446 Pages | ISBN: 1449316409 | EPUB PDF | 3 MB 20 MB SQL is full of difficulties and traps for the...
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In this book, Chris Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it to your use of SQL.