By Anthony Molinaro
You recognize the rudiments of the SQL question language, but you are feeling you aren't taking complete benefit of SQL's expressive energy. You'd prefer to tips on how to do extra paintings with SQL contained in the database sooner than pushing facts around the community in your functions. You'd prefer to take your SQL talents to the subsequent level.
Let's face it, SQL is a deceptively uncomplicated language to profit, and plenty of database builders by no means move a long way past the straightforward assertion: choose columns FROM desk the place stipulations. yet there's much more you are able to do with the language. within the SQL Cookbook , skilled SQL developer Anthony Molinaro stocks his favourite SQL innovations and lines. You'll examine about:
•Window capabilities, arguably the main major enhancement to SQL long ago decade. If you're now not utilizing those, you're lacking out
•Powerful, database-specific good points similar to SQL Server's PIVOT and UNPIVOT operators, Oracle's version clause, and PostgreSQL's very important GENERATE_SERIES function
•Pivoting rows into columns, reverse-pivoting columns into rows, utilizing pivoting to facilitate inter-row calculations, and double-pivoting a outcome set
•Bucketization , and why you'll want to by no means use that time period in Brooklyn.
•How to create histograms, summarize facts into buckets, practice aggregations over a relocating diversity of values, generate running-totals and subtotals, and different complicated, info warehousing techniques
•The means of walking a string , which lets you use SQL to parse during the characters, phrases, or delimited parts of a string
Written in O'Reilly's renowned Problem/Solution/Discussion type, the SQL Cookbook is bound to delight. Anthony's credo is: "When it comes all the way down to it, all of us visit paintings, all of us have money owed to pay, and all of us are looking to pass domestic at an inexpensive time and revel in what's nonetheless to be had of our days." The SQL Cookbook strikes speedy from challenge to resolution, saving you time every one step of how.
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You recognize the rudiments of the SQL question language, but you are feeling you aren't taking complete good thing about SQL's expressive energy. You'd wish to tips on how to do extra paintings with SQL contained in the database ahead of pushing facts around the community for your purposes. You'd prefer to take your SQL abilities to the subsequent point.
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Extra resources for SQL Cookbook
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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