Prepare 4 interview - Recent questions and answers

Answered: What is a self-join, in MS SQL Server?

Tue, 31 Jan 2012 10:35:06 +0000

self join is join the table to itself.
ex: select col1,col2 from tbl a inner join tbl b on a.col1=b.col2
there is only one table called in the above query tbl

Answered: What is a Sub-Query, in MS SQL Server?

Tue, 31 Jan 2012 10:32:03 +0000

Sub query: is the secondary query in a query.
ex: select col1,col2 from (select scol1 as col1,scol2 as col2 from sub_query_tbl) as a
the query in paranthesis is sub query , in subquery no order by should use.
there are diff types of sub queries exists,
independent sub query, correlated sub query,single valued,multi valued

Answered: What is the default “SORT” order for a SQL, in MS SQL Server?

Tue, 31 Jan 2012 10:27:53 +0000

The default sort order is alphabtic (if userid column exists), else we see there no such order when all are int datatype.

Answered: What is CTE (Common Table Expression), in MS SQL Server?

Wed, 25 Jan 2012 23:50:22 +0000

CTE is a temporary named result set that you can reference within a SELECT, INSERT, UPDATE, or DELETE statement.

why we use execute sql task

Mon, 09 Jan 2012 06:35:51 +0000

why we will take execute sql task in ssis?

Answered: Explain the purpose of synchronization feature provided in Analysis Services 2005

Tue, 13 Dec 2011 08:19:53 +0000

Synchronization feature is used to copy database from one source server to a destination server. While the synchronization is in progress, users can still browse the cubes. Once the synchronization is complete, the user is redirected to the new Synchronized database.

Answered: Where do you see yourself five years from now?

Sun, 27 Nov 2011 15:02:59 +0000

Do you know http://it-how.com ?

Answered: Why should I hire you?

Sun, 27 Nov 2011 15:02:22 +0000

Super answer site: http://it-how.com

Answered: Why are you leaving this position?

Sun, 27 Nov 2011 15:01:39 +0000

Do you know http://it-how.com ?

Answered: If you specify the data type as DECIMAL (5,2), what’s the range of values that can go in this table?

Sun, 27 Nov 2011 14:59:55 +0000

Do you know http://it-how.com ?

TELL ME SOMETHING ABOUT YOURSELF

Sun, 20 Nov 2011 05:17:37 +0000

GIVE ME SUGGESTETION WHAT TO ANSWER

Answered: How do you sort in SQL, in MS SQL Server?

Mon, 07 Nov 2011 10:43:42 +0000

using Order by

Answered: You want to select the first record in a given set of rows, in MS SQL Server?

Mon, 07 Nov 2011 10:42:33 +0000

Select top 1 * from table name

What is the latest version of .NET

Sun, 09 Oct 2011 17:15:18 +0000

Answered: Which namespace is used to access WCF service?

Wed, 05 Oct 2011 16:10:33 +0000

System.ServiceModel

Answered: what are design patterns?

Wed, 05 Oct 2011 16:02:14 +0000

Design patterns are recurring solutions to software design problems you find again and again in real-world application development. Patterns are about design and interaction of objects, as well as providing a communication platform concerning elegant, reusable solutions to commonly encountered programming challenges.

The Gang of Four (GoF) patterns are generally considered the foundation for all other patterns. They are categorized in three groups: Creational, Structural, and Behavioral. Here you will find information on these important patterns.

To give you a head start, the C# source code is provided in 2 forms: 'structural' and 'real-world'. Structural code uses type names as defined in the pattern definition and UML diagrams. Real-world code provides real-world programming situations where you may use these patterns.

A third form, '.NET optimized' demonstrates design patterns that exploit built-in .NET 4.0 features, such as, generics, attributes, delegates, object and collection initializers, automatic properties, and reflection

What is Unix?

Thu, 22 Sep 2011 07:21:51 +0000

What is UniX

Answered: Write a function that inserts an integer into a linked list in ascending order. Write the test cases for this function.

Sat, 06 Aug 2011 01:12:23 +0000

Is the linkedlist already in ascending order? or we have to make it ascending after inserting new node

Write a function that counts the number of primes in the range [1-N]. Write the test cases for this function.

Fri, 05 Aug 2011 17:38:12 +0000

How would you deal with a bug that no one wants to fix? Both the SDE and his lead have said they won't fix it.

Fri, 05 Aug 2011 17:37:04 +0000

How would you deal with changes being made a week or so before the ship date?

Fri, 05 Aug 2011 17:35:46 +0000

what is the retail banking?

Wed, 27 Jul 2011 10:17:09 +0000

what is the retail banking?

Answered: Tell me about the Greenplum Architecture

Fri, 15 Jul 2011 07:17:58 +0000

Greenplum Database is able to handle the storage and processing of large amounts of data by distributing the load across several servers or hosts. A database in Greenplum is actually an array of individual PostgreSQL databases, all working together to present a single database image. The master is the entry point to the Greenplum Database system. It is the database instance where clients connect and submit SQL statements. The master coordinates the work amongst the other database instances in the system, the segments, which handle data processing and storage.

Answered: How to create and use Greenplum External tables?

Fri, 15 Jul 2011 06:48:35 +0000

The CREATE EXTERNAL TABLE command creates an external table definition in Greenplum Database. External table data is considered static (meaning the data does not change midstream during the execution of a query). This allows the query planner to choose plans that allow for rescanning of the external table data.

You may specify multiple external data sources or URIs (uniform resource identifiers) with the LOCATION clause — up to the number of primary segment instances in your Greenplum Database array. Each URI points to an external data file or data source. These URIs do not need to exist prior to defining an external table (CREATE EXTERNAL TABLE does not validate the URIs specified). However you will get an error if they cannot be found when querying the external table.

There are two protocols that you can use to access the external table data sources.
1. gpfdist
2. file

Answered: What is the difference between external tables and web tables of Greenplum database?

Fri, 15 Jul 2011 06:23:53 +0000

The main difference between external tables and web tables are their data sources. External tables access static flat files, whereas web tables access dynamic data sources — either on a web server or by executing OS commands or scripts. When a query is planned using an external table, the external table is considered rescannable since the data is thought to be static for the course of the query. For web tables, the data is not rescannable because there is the possibility that the data could change during the course of the query’s execution.

Answered: What is external tables and web tables in Greenplum database?

Fri, 15 Jul 2011 06:22:30 +0000

External tables and web tables provide an easy way to perform basic extraction, transformation, and loading (ETL) tasks that are common in data warehousing. External and web table data is read in parallel by the Greenplum Database segment instances, so they also provide a means for fast data loading.

Once an external or web table is defined, its data can be queried directly (and in parallel) using SQL commands. You can, for example, select, join, or sort external or web table data. You can also create views for external or web tables. However external and web tables are read-only. DML operations (UPDATE, INSERT, DELETE, or TRUNCATE) are not allowed, and you cannot create indexes on external or web tables.

An external or web table definition can be thought of as a view that allows running any SQL query against external data sources without requiring that data to first be loaded into the database. External and web tables provide an easy way to perform basic extraction, transformation, and loading (ETL) tasks that are common in data warehousing. External and web table files are read in parallel by the Greenplum Database segment instances, so they also provide a means for fast data loading.

Answered: What is Greenplum database?

Fri, 15 Jul 2011 06:19:23 +0000

Greenplum Database is a massively parallel processing (MPP) database server based on PostgreSQL open-source technology. MPP (also known as a shared nothing architecture) refers to systems with two or more processors which cooperate to carry out an operation - each processor with its own memory, operating system and disks. Greenplum leverages this high-performance system architecture to distribute the load of multi-terabyte data warehouses, and is able to use all of a system’s resources in parallel to process a query.

Answered: What is the difference between DELETE and TRUNCATE?

Wed, 06 Jul 2011 09:09:52 +0000

Truncate:1)deletes all the data but the strucure of table remains 2)Faster Compared to delete.3)truncate is autocommited statment.
delete:1)deletes all data but the structure remains same.2)slow compared to truncate.3)Delete is not auto commited.

i am a mca 2011 batch pass out and i want to join a job in a software industry?

Tue, 21 Jun 2011 11:47:37 +0000

Answered: How to do sql server performance turning?

Tue, 31 May 2011 03:49:26 +0000

What are the measures shoud be consider during sql server performance turning?What are the measures shoud be consider during sql server performance turning?What are the measures shoud be consider during sql server performance turning?

Answered: How to import table using “INSERT” statement, in MS SQL Server?

Sun, 10 Apr 2011 17:48:39 +0000

insert into tablename
select * from otherdb.dbo.othertable

above statement can be used to import data from other database.
We can use OPENROWSET utility.

Answered: What is a DDL, DML and DCL concept in RDBMS world, in MS SQL Server?

Sat, 09 Apr 2011 10:47:20 +0000

DDL (Data definition language) defines our database structure. CREATE and ALTER are DDL statements as they affect the way our database structure is organized.
DML (Data Manipulation Language) lets we do basic functionalities like INSERT, UPDATE, DELETE and MODIFY data in database.
DCL (Data Control Language) controls you DML and DDL statements so that your data is protected and has consistency. COMITT and ROLLBACK are DCL control statements. DCL guarantees ACID fundamentals of a transaction.

Answered: What are the points to keep in mind for performance improvement of the package?

Fri, 18 Mar 2011 16:43:59 +0000

http://technet.microsoft.com/en-us/library/cc966529.aspx

Answered: SSIS control flow items

Tue, 08 Feb 2011 17:40:17 +0000

To know more about SSIS control flow items, please have a look at this question.

http://prepare4interview.com/965/various-control-flow-items-in-ssis

It is already answered.

Answered: options for using df command

Wed, 02 Feb 2011 11:44:18 +0000

u can use df -kh
for showing disk utilization in MB or GB

Answered: Difference between DTS and SSIS?

Fri, 07 Jan 2011 01:50:26 +0000

dts is ETLS TOOL AS SSIS.but ssis is advanced version of dts.
ssis have deployment wizard where dts dosen't
ssis have more transformation objects than dts

Answered: What is Extent and Page?

Sun, 19 Dec 2010 21:03:14 +0000

extent is group 8 data pages each of 8kb and datapage where data stored and of 8kb.

Answered: What are the Reporting Services components?

Sun, 19 Dec 2010 16:44:47 +0000

1) Report Designer
2) Report manager
3) Report server

Answered: Type your question here! No need to register!

Sun, 19 Dec 2010 07:26:44 +0000

Try this..

http://www.sqlshare.com/channel.aspx?cat=c871236d-8554-42e3-8683-4d422356c0bd

Answered: What is the most difficult writing assignment you have undertaken recently? What made it challenging? How did you handle it?

Thu, 16 Dec 2010 15:35:30 +0000

The most difficult writing assignment I have ever undertaken was a simple GED level writing assignment asking to write a pages worth of what I aspired to do in my life.

I found this challenging, in the sense that I simply had no dreams or aspirations or hope of going anywhere with my life. as I thought about what I would have aspired to be before I fell into a depression my mind continued coming up blank further frustrating me.

So I blatantly lied that I would have liked to become a computer engineer.

Answered: write a query to display middle record in emp table

Mon, 22 Nov 2010 07:58:28 +0000

select * from
(select ROW_NUMBER() OVER(ORDER BY empno) sno, empno,ename from emp)
where
sno in
(
select floor((count(*)+1)/2) eg from emp
union
select ceil((count(*)+1)/2) eg from emp
)

Try this..

Answered: What are the major differences between services and Web services? What is the difference WCF and Web services?

Wed, 10 Nov 2010 11:30:10 +0000

The Windows Communication Foundation (or WCF) is an application programming interface (API) in the .NET Framework for building connected, service-oriented applications.

What are different bindings supported by WCF?

Sun, 31 Oct 2010 18:53:26 +0000

What are the advantages of hosting WCF Services in IIS as compared to self-hosting?

Sun, 31 Oct 2010 18:50:21 +0000

Answered: How do we host a WCF service in IIS?

Sun, 31 Oct 2010 18:46:29 +0000

First thing you will need is to create the SVC file, which exposes the service class. SVC file contains the pointer to the class. You can see from the figure below the class attribute points to the class whose interface is exposed by the service.svc.cs file. Also, note the actual interface is in service.svc.cs file. Below figure, have both the files service.svc, which has the class attribute which points to the service class, and the interface, which resides in service.svc.cs file.

what are the various ways of hosting a WCF service?

Sun, 31 Oct 2010 18:45:36 +0000

Answered: What are the main components of WCF?

Sun, 31 Oct 2010 18:44:10 +0000

We need to define three main components in WCF:-
* Service class.
* Hosting environment
* End point

Which specifications does WCF follow?

Sun, 31 Oct 2010 18:42:40 +0000

Answered: What are ends, contract, address, and bindings?

Sun, 31 Oct 2010 18:34:59 +0000

The above terminologies are the core on which SOA stands. Every service must expose one or more ends by which the service can be available to the client. End consists of three important things where, what and how:-
• Contract (What)
Contract is an agreement between two or more parties. It defines the protocol how client should communicate with your service. Technically, it describes parameters and return values for a method.
• Address (Where)
An Address indicates where we can find this service. Address is a URL, which points to the location of the service.
• Binding (How)
Bindings determine how this end can be accessed. It determines how communications is done. For instance, you expose your service, which can be accessed using SOAP over HTTP or BINARY over TCP. So for each of these communications medium two bindings will be created.
Below figure, show the three main components of end. You can see the stock ticker is the service class, which has an end hosted on www.soa.com with HTTP and TCP binding support and using Stock Ticker interface type.

Answered: What are the important principles of SOA (Service oriented Architecture)?

Sun, 31 Oct 2010 18:29:46 +0000

WCF is based on SOA. All big companies are playing big bets on SOA. So how can Microsoft remain behind? So in order to implement SOA architecture easily you need to use WCF.
SOA is based on four important concepts:-
• Boundaries are well defined
In SOA, everything is formalized. The client who is consuming the service does not need to know how the implementation of the service is done. If you look at some old methodologies of communication like DCOM. Any changes at server level the client also has to change. Therefore, the server and client implementation was so much bound that changes need to be done at all places. In SOA, the rule is if you do enhancement you do not need to change anything at the client. SOA based application only understands that there is an end point, contract, and bindings.
• Services evolve
Change is the law of nature and services will evolve. In SOA, services can be versioned and you can host those services in new ends. For instance, you have a service called as “Search Tickets (Ticket Number) “which gives details based on Ticket Number and its exposed on end point “ep1”. Tomorrow you want make your Search Tickets service more useful by also providing an extra option of allowing him to search by passenger name. Therefore, you just declare a new end “ep2” with service “Search Tickets (Ticket Number, Passenger Name)”. So the client who is consuming the service at end ep1 continues and at the other end, we have evolved our service by adding new ends ep2.
• Services share only schemas and contracts
Services use Schemas to represent data and contracts to understand behavior. They do not use language dependent types or classes in order to understand data and behavior. XML is used to define schemas and contracts. Due to this, there is not heavy coupling between environments.
• Service compatibility is policy based
Policy describes the capabilities of the system. Depending on policies, the service can degrade to match the service for the client. For instance your service needs to be hosted for two types of client one which uses Remoting as the communication methodology while other client uses DCOM. An ideal SOA service can cater to both of them according to there communication policies.