Sql queries for mere mortals third edition pdf


 

Praise for SQL Queries for Mere Mortals®, Second Edition I learned SQL primarily from the first edition of this book, and I am pleased to see a second We created the third set of databases using the popular open-source. [Free] Sql Queries For Mere Mortals A Hands On Guide To Data Manipulation In Sql 3rd Edition. [PDF] [EPUB] -. SQL QUERIES FOR MERE MORTALS A. Download or read Aqualeo's The Book of SQL Queries for Mere Mortals: A Hands -On Guide to Data Manipulation in SQL (3rd Edition), by click.

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Sql Queries For Mere Mortals Third Edition Pdf

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SQL Queries for Mere Mortals®: A Hands-On Guide to Data Manipulation in SQL, Third Edition

Hernandez guide you through creating reliable queries for virtually any modern SQL-based database. They demystify all aspects of SQL query writing, from simple data selection and filtering to joining multiple tables and modifying sets of data. Next comes a chapter on how to get more than simple columns returned by your queries.

This is essentially a look at expressions showing what they are and how to use them in a Select clause. The final chapter in this part of the book looks at filtering your data using Where, search conditions, and using multiple conditions with And and Or. The next part of the book moves on to working with multiple tables, starting with an introduction to sets and set operations — intersections, differences, and unions.

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Having covered the theory, the SQL Set operations are then introduced. The examples used by the authors for illustrating joins make the subject nice and clear. The authors have a nice technique for showing how to create a query where they take a request list the recipe types in my cookery database that do not yet have any recipes. At this stage the extra words are shown crossed out. This technique is used all the way through the book and it does give a useful guide into the steps of building a query.

This has chapters on working out simple totals using aggregate functions such as Sum, Count, Avg, Max and Min; grouping data using the Group By clause; and filtering using Having.

The latter chapter is good at explaining the problems you can get into over where to put your filter — in the Where or Having clause, what the Having Count problems are, and so on.

Three chapters on the modifying operators — Update, Insert and Delete — take you from the basics through to more advanced problems such as dealing with transactions, generating primary keys while inserting, and how to avoid key violations when deleting.

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