By Paul Wilton

ISBN-10: 1457107791

ISBN-13: 9781457107795

SQL works with databases to insert and extract facts and is a global usual for manipulating facts in databases. This hands-on source covers every thing from a evaluate of SQL fundamentals and database layout to making your individual databases and utilizing the SQL language in numerous database purposes. jam-packed with crucial code, theories, options, and strategies, in addition to a cache of beneficial examples, this entire textual content may have you speedy designing your personal databases and writing SQL code adequate for lots of real-world events. perform routines in each one bankruptcy support accelerate your comprehension.

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Each database you create receives its own specific name or identifier. How a database system manages databases and tables varies depending on your RDBMS. Microsoft Access, for example, works on only one database at a time, although there are ways of linking one database to another. Each Access database is contained in its own file. Other RDBMSs allow you to manage more than one database from the same console. Relational Database Management System Database Database Table Table Table Table Field Field Field Field Field Field Field Field R e c o r d R e c o r d Table Table Field Field Field Field Field Figure 1-2 Within each database is a collection of tables that contain the records, which hold the data.

For example, SQL Server has the Query Analyzer tool, DB2 has the Command Center, and MySQL has the MySQL Control Center (among many other similar tools). Regardless of the tool you choose to use, the SQL required to create a new database is as follows: CREATE DATABASE myFirstDatabase; It really is that easy! Once you become more advanced, you discover a plethora of options you can play with, but for the purposes of this book, the default options used by the CREATE DATABASE statement are fine. The database is called myFirstDatabase, but you could have called it pretty much anything.

Be aware of differences in date formats. S. it’s December 1, 2006. time Stores the time. Three bytes. time, for example, 17:54:45. Note that the storage requirements pertain only to the actual data. The RDBMS usually requires a little bit of extra storage to make a note of where in its memory the data is stored. However, these internal workings are not something you need to worry about unless you’re involved in very advanced database work. Also, details may vary depending on the RDBMS system you use.

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Beginning SQL by Paul Wilton

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