By Karli Watson
* supplying newcomers with the fundamentals of databases, database layout, and SQL programming, this booklet exhibits amateur programmers find out how to use C# and ADO.NET to govern info in databases * comprises hands-on examples, useful counsel, and real-world eventualities on having access to facts from home windows functions, ASP.NET purposes, and net providers * The SQL supplier for gaining access to SQL Server databases, ADO.NET, and the hot .NET 2.0 beneficial properties * Covers the basics of having access to and manipulating facts whereas giving an excellent figuring out of relational database layout * subject matters lined comprise editing facts, customized information binding, operating with disconnected facts, and masses extra
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The other aspect of security in databases is authorizing different users to perform different tasks. In some cases, such as in SQL Server 2005, you can approach this in a granular way. You can, for example, assign a user the rights to view data in one table but not to edit that data. You can also restrict access to individual stored procedures and control access to all manner of more esoteric functionality. Users can also be authorized to perform tasks at the DBMS level if required — such as being able to create new databases or manage existing databases.
Find all the people whose phone numbers contain numbers whose sum is less than 40. ❑ Find all the people whose address contains the phrase “Primrose” and who are listed with full names rather than initials. Some of these operations might require a little more effort to set up than others, but they can all be done. In most cases they can be achieved by querying the database in certain ways, which means asking for the data in the right way, rather than manipulating data after it has been obtained using, say, C#.
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.