first difference between these two are, in DELETE you can use WHERE clause, whereas in TRUNCATE you cannot, TRUNCATE is to delete everything or nothing.

second difference, TRUNCATE is very quick in deleting records from the table, by deallocating the data pages used by the table, this means there wont be transactions logs available for the deletion, also the table cannot be restored, this is not a best option to use in production environment, if used and you need some information on truncation from transaction logs, only way is to look out for page deallocation in transaction logs. whereas DELETE will delete rows one at a time, which means it will log the deletion in transactions log, and maintains log sequence number information. if required the deletion can be rolled back.

1) SELECT LEN ( 'raja') -- result: 4 
2) SELECT LEN ( 'raja ') -- result: 4
3) SELECT LEN ( ' raja') -- result: 5 
4) SELECT LEN ( 'raja 1') -- result: 6 
5) SELECT LEN ( 'raja 1 ') -- result: 6

From the above example you can notice that 1 & 2 and 4 & 5 have same results even with the trailing spaces. if this trailing space count matters to you, then it is better to use DATALENGTH() function.

1) SELECT DATALENGTH ( 'raja') -- result: 4 
2) SELECT DATALENGTH ( 'raja ') -- result: 5
3) SELECT DATALENGTH ( ' raja') -- result: 5 
4) SELECT DATALENGTH ( 'raja 1') -- result: 6 
5) SELECT DATALENGTH ( 'raja 1 ') -- result: 7

Caution: if you are working with unicode data, you need to divide the result by 2, as a character takes two bytes.

screen:

i am trying to build a calculator application which will collect two numbers via text box, and then add the two numbers when the “add” button is clicked. by default the textbox entries are treated as string,  so to make the calculator work, we need to convert those string to integer to make the calculation.

int firstNumber;
firstNumber = Convert .ToInt32(textBox1.Text);

sample code:

private void btnAdd_Click(object sender, EventArgs e)
        {
            int firstNumber;
            int secondNumber;
            int Answer;

            firstNumber = Convert.ToInt32(fNo.Text);
            secondNumber = Convert.ToInt32(sNo.Text);

            //firstNumber = 10;
            //secondNumber = 20;

            Answer = firstNumber + secondNumber;

            MessageBox.Show(Answer.ToString());

        }

When executed C# console applications will close as soon as the executing is completed, this as a beginner, i couldn’t catch watch the outcome, within fraction of seconds the window get closed. after googling i found, adding this two lines would prevent that immediate closing, that is we handle a problem in code.

Console.WriteLine("Hello, World!");

Console.WriteLine("Press any key to exit..." );

Console.ReadLine();

Or

Console.WriteLine("Hello, World!");          
Console.Read();

Outcome:

range(x) will return a list of numbers from 0 to x-1

>>> range(1)
[0]
>>> range(2)
[0, 1]
>>> range(3)
[0, 1, 2]
>>> range(4)
[0, 1, 2, 3]

you can have the range start at specified number till the range specified number( minus 1)

>>> range(5, 10)
[5, 6, 7, 8, 9]

range can have different increments as below:

>>> range(0, 10, 3)
[0, 3, 6, 9]
>>> range(-10, -100, -30)
[-10, -40, -70]

i use this range to auto generate numbers or id in the program

http://www.pythonanywhere.com/

which is very neat website, which runs your python console application in their server and show the result in website, user can interact with the application, just like they are running the application from their own computer console.

you can just share the direct output to the user, without exposing your code.

hope this was useful.

--left join
select cardno from cards1 A left join contact1 B on A.Cardtype = B.CardType

Left Join with condition:

-- left join with condition 
select cardno from cards1 A left join contact1 B on A.cardtype = B.cardtype 
where lastname = 'raja'

Right Join:

-- right join 
select cardno from cards1 A right join contact1 B on A.cardtype = b.cardtype

Right Join with condition:

-- right join with condition
select cardno from cards1 A right join contact1 B on A.cardtype = b.cardtype 
where lastname = 'raja'

Full Outer Join:

--full outer join
select cardno from cards1 A full outer join contact1 B on A.cardtype = B.cardtype

Inner Join:

-- inner join 
select cardno from cards1 A inner join contact1 B on A.cardtype = B.cardtype

• the IP PBX is acronym for Internet Protocol Private Branch Exchange
• it is the integral part of VoIP  network
• there is difference between IP PBX and IP-enabled PBX
• • IP PBX has provision for IP
  • IP enabled PBX adds IP as functionality to existing product as added feature
• pbx is a switching system that will connect internal telephone systems and PSTN
• • if the majority of the calls will be on voip then IP PBX is chose
• pbx & ip pbx comes advanced user applications like with call forwarding, call conference, call hold etc
• in pbx, voice transmission happens at normal phone lines 
• in ip pbx the voice transmission happens as voice packets over data network(internet) 

there’s three types of PBX architecture like: 

• IP
• Hybrid IP
• Legacy Time Division Multiplier (TDM)

IP Architecture: 

1. it does all the switching
2. there is no transcoding between TDM bus and IP bus
3. it is scalable 
4. doesnt require additional hardwares to do digital signal processing to convert media
5. cisco call managers and Asterisk are examples

Hybrid IP Architecture: 

1. must convert its media between TDM and IP 
2. requires more resources to do the transcoding
3. has limitations on how many ip phones can be used 
4. Avaya Communication Manager, Avaya IP office, are examples

Legacy Time Division Multiplier (TDM) architecture:

1. it is TDM only solution so no converting between IP and TDM bus
2. Avaya Definity, Avaya Partner are examples

that needs to be sorted in 0′s, 1′s and then 2′s, how do we do that?

python does it easily by single word command: sort

a = [0,0,2,2,1,1,2,0,2,1,2]
a.sort()
print a