By Karli Watson
* delivering rookies with the fundamentals of databases, database layout, and SQL programming, this booklet exhibits beginner programmers the right way to use C# and ADO.NET to govern info in databases * contains hands-on examples, invaluable counsel, and real-world eventualities on gaining access to information from home windows purposes, ASP.NET purposes, and net providers * The SQL supplier for gaining access to SQL Server databases, ADO.NET, and the recent .NET 2.0 gains * Covers the basics of getting access to and manipulating facts whereas giving a great knowing of relational database layout * subject matters lined comprise editing facts, customized information binding, operating with disconnected info, and lots more and plenty extra
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Additional info for Beginning C# 2005 Databases
It is important that you cover the basics of XML here because you are likely to need to know about it before too long. The remainder of this section covers two topics: ❑ A SQL Primer: The basics of the SQL language and what you can do with it. ❑ XML: A brief overview of the XML language and further information on its relevance in the context of databases. A SQL Primer This section is by no means a comprehensive guide to using SQL. In fact, entire books are devoted to the subject, including one co-written by yours truly: The Programmer’s Guide to SQL (APress, 2003.
The exact implementation of an index is specific to the DBMS you are using so you can’t make any assumptions about exactly how they are stored or how they work. However, you don’t need to understand how an index is implemented to use it. Conceptually you can think of an index as a look-up table, where you find rows in the index with a specific piece of data in one column, and the index then tells you the rows in the indexed table that match that data. To return to the phone book example, an index could be used to search for records via the phone number column instead of the name column.
Functions Any good DBMS supplies you with an extensive set of functions to use to view and manipulate data. You are likely to find mathematical functions, conversion functions, string manipulation functions, date and time manipulation functions, and so on. These enable you to perform much of your data processing inside the DBMS, reducing the amount of data that needs to be transferred to and from your applications, and improving efficiency. DBMS functions can take several forms. There are scalar functions that return single values, table valued functions that can return multiple rows of data, and aggregate functions that work with entire data sets rather than individual values.