By Joe Celko
Completely clever programmers frequently fight whilst pressured to paintings with SQL. Why? Joe Celko believes the matter lies with their procedural programming mind-set, which retains them from taking complete good thing about the ability of declarative languages. the result's overly complicated and inefficient code, let alone misplaced productivity.
This e-book will swap how you take into consideration the issues you clear up with SQL programs.. concentrating on 3 key table-based suggestions, Celko unearths their energy via special examples and transparent causes. As you grasp those thoughts, you’ll locate you could conceptualize difficulties as rooted in units and solvable via declarative programming. earlier than lengthy, you’ll be coding extra fast, writing extra effective code, and making use of the total strength of SQL.
• full of the insights of 1 of the world’s major SQL professionals - famous for his wisdom and his skill to educate what he knows.
• specializes in auxiliary tables (for computing features and different values through joins), temporal tables (for temporal queries, old information, and audit information), and digital tables (for greater performance).
• offers transparent assistance for choosing and properly making use of the proper desk approach.
Read or Download Joe Celko's Thinking in Sets: Auxiliary, Temporal, and Virtual Tables in SQL (The Morgan Kaufmann in Data Management Systems) PDF
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Extra resources for Joe Celko's Thinking in Sets: Auxiliary, Temporal, and Virtual Tables in SQL (The Morgan Kaufmann in Data Management Systems)
Xxviii | Preface This is the Title of the Book, eMatter Edition Copyright © 2012 O’Reilly & Associates, Inc. All rights reserved. I would like to thank Sanjay Mishra for his excellent Mastering Oracle SQL book, and also for putting me in touch with Jonathan. If not for Sanjay, I may have never been in touch with Jonathan and never would have written this book. Amazing how a simple email can change your life. I would like to thank David Rozenshtein, especially, for his Essence of SQL book, which provided me with a solid understanding of how to think and problem solve in sets/SQL.
For example, you want to display the names of all employees in department 10 along with the location of each employee’s department, but that data is stored in two separate tables. deptno = 10 Discussion The solution is an example of a join, or more accurately an equi-join, which is a type of inner join. A join is an operation that combines rows from two tables into one. , where one department number equals another). An inner join is the original type of join; each row returned contains data from each table.
Oracle fetches the next row and calls it row number 1. This is because the first row to be returned from the query must be numbered as 1. 5. Go to step 3. Study this process closely, and you can see why the use of ROWNUM = 5 to return the fifth row fails. You can’t have a fifth row if you don’t first return rows one through four! You may notice that ROWNUM = 1 does, in fact, work to return the first row, which may seem to contradict the explanation thus far. The reason ROWNUM = 1 works to return the first row is that, to determine whether or not there are any rows in the table, Oracle has to attempt to fetch at least once.
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