dot Net Database Interview Questions and Answers

1 :: Explain How do we separate business logic while creating an ASP.NET application?

There are two level of asp.net debugging
1. Page level debugging
For this we have to edit the page level debugging enable the trace to true in the line in the html format of the page.

%@ Page Language="vb" trace="true" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb" Inherits="WebApplication2.WebForm1">

2. You can enable the debugging in the application level for this
Edit the following trace value in web.config file

Enable trace enabled=true.

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2 :: Explain What are good ADO.NET object(s) to replace the ADO Recordset object?

The differences includes
In ADO, the in-memory representation of data is the Recordset.
In ADO.net, it is the dataset

A recordset looks like a single table in ADO
In contrast, a dataset is a collection of one or more tables in ADO.net

ADO is designed primarily for connected access
ADO.net the disconnected access to the database is used

In ADO you communicate with the database by making calls to an OLE DB provider.
In ADO.NET you communicate with the database through a data adapter (an OleDbDataAdapter, SqlDataAdapter, OdbcDataAdapter, or OracleDataAdapter object), which makes calls to an OLE DB provider or the APIs provided by the underlying data source.

In ADO you cant update the database from the recordset. ADO.NET the data adapter allows you to control how the changes to the dataset are transmitted to the database

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3 :: Explain What is the .NET datatype that allows the retrieval of data by a unique key?

.Net data type is a type of data. Which is use in query.
Data type as like interger, char, varchar, numeric, money, date etc.

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4 :: Explain similarities and differences between the Java and .NET?

The difference is that java is fully platform independent but .net is not fully independent ant other difference id that some tools of java is more complex compare with .net like setup and deployment.
but java and .net also some similarities that both platform are deploy window and web application and both are use server like IIs and tomcat5.5 .

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5 :: Name 3 ways you can get an accurate count of the number of records in a table Using query analyzer?

SELECT count( * ) as totalrecords FROM employee
This will display total records under the name totalrecords in the table employee

use COUNT_BIG
Returns the number of items in a group.

@@ROWCOUNT
Returns the number of rows affected by the last statement.
Use this statement after an SQL select * statement, to retrieve the total number of rows in the table

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