|Subject||Re: [Firebird-general] SQL and Relational Theory|
>I have another book by CJ Date book but sometimes is too pedantic andCould be interesting, thanks for the tip.
> i loose the sight
> (it's like reading Lord Of The Rings, you must have patience to read
> this dialect )
> Let's hope that this one is good , and i might kill some trees buying it
> and The White Wizard can show us how to apply Relational theory to SQL
> C.J. Date demonstrates how you can apply relational theory directly to
> your use of SQL. With numerous examples and clear explanations of the
> reasoning behind them, you'll learn how to deal with common SQL
> dilemmas, such as:
> * Should database access granted be through views instead of base
> * Nulls in your database are causing you to get wrong answers.
> Why? What can you do about it?
> * Could you write an SQL query to find employees who have never
> been in the same department for more than six months at a time?
> * SQL supports "quantified comparisons," but they're better
> avoided. Why? How do you avoid them?
> * Constraints are crucially important, but most SQL products don't
> support them properly. What can you do to resolve this situation?
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