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Category : Electronic journals
Languages : en
Pages : 532
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Author: John L. Viescas
Publisher: Pearson Education
ISBN: 0321992474
Category : Computers
Languages : en
Pages : 792
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Book Description
The #1 Easy, Common-Sense Guide to SQL Queries--Updated for Today's Databases, Standards, and Challenges SQL Queries for Mere Mortals ® has earned worldwide praise as the clearest, simplest tutorial on writing effective SQL queries. The authors have updated this hands-on classic to reflect new SQL standards and database applications and teach valuable new techniques. Step by step, John L. Viescas and Michael J. 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. Three brand-new chapters teach you how to solve a wide range of challenging SQL problems. You'll learn how to write queries that apply multiple complex conditions on one table, perform sophisticated logical evaluations, and think "outside the box" using unlinked tables. Coverage includes -- Getting started: understanding what relational databases are, and ensuring that your database structures are sound -- SQL basics: using SELECT statements, creating expressions, sorting information with ORDER BY, and filtering data using WHERE -- Summarizing and grouping data with GROUP BY and HAVING clauses -- Drawing data from multiple tables: using INNER JOIN, OUTER JOIN, and UNION operators, and working with subqueries -- Modifying data sets with UPDATE, INSERT, and DELETE statements Advanced queries: complex NOT and AND, conditions, if-then-else using CASE, unlinked tables, driver tables, and more Practice all you want with downloadable sample databases for today's versions of Microsoft Office Access, Microsoft SQL Server, and the open source MySQL database. Whether you're a DBA, developer, user, or student, there's no better way to master SQL. informit.com/aw forMereMortals.com
Author:
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ISBN:
Category : Electronic journals
Languages : en
Pages : 532
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Author: William S. Levine
Publisher: Springer Science & Business Media
ISBN: 9780817639662
Category : Computers
Languages : en
Pages : 372
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Book Description
One of the major concerns of theoretical computer science is the classifi cation of problems in terms of how hard they are. The natural measure of difficulty of a function is the amount of time needed to compute it (as a function of the length of the input). Other resources, such as space, have also been considered. In recursion theory, by contrast, a function is considered to be easy to compute if there exists some algorithm that computes it. We wish to classify functions that are hard, i.e., not computable, in a quantitative way. We cannot use time or space, since the functions are not even computable. We cannot use Turing degree, since this notion is not quantitative. Hence we need a new notion of complexity-much like time or spac~that is quantitative and yet in some way captures the level of difficulty (such as the Turing degree) of a function.
Author: Anonymous
Publisher: BoD – Books on Demand
ISBN: 3382315653
Category : Fiction
Languages : en
Pages : 682
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Reprint of the original, first published in 1858. The publishing house Anatiposi publishes historical books as reprints. Due to their age, these books may have missing pages or inferior quality. Our aim is to preserve these books and make them available to the public so that they do not get lost.
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Category : Genealogy
Languages : en
Pages : 406
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Author: George Ernest Bowman
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Category : Pilgrims (New Plymouth Colony)
Languages : en
Pages : 172
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Author: William White
Publisher: BoD – Books on Demand
ISBN: 3375017103
Category : Fiction
Languages : en
Pages : 558
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Reprint of the original, first published in 1862.
Author: Beaver Henry Blacker
Publisher:
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Category : Gloucestershire (England)
Languages : en
Pages : 624
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Author: Samuel Tymms
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Category : Cambridgeshire (England)
Languages : en
Pages : 946
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Category :
Languages : en
Pages : 660
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