Example:

Abstract class  myAbstClass

{

public myAbstClass()

{ }

private myAbstClass(int x)

{ //some implementation }

protected myAbstClass(string strX, string strY, int x)

{ //some implementation }

}

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Q. I have a following table :

I want results as :

Ans: At the time of interview I wasn’t easy with the answer but I wrote a query, but interviewer not satisfied.

I got the following proper query/solution from one of my colleagues Mr. sandeep Walia:

declare @tbl table(university varchar(100),Utotals int, status varchar(100),statuscnt int)

insert into @tbl(university,Utotals,status,statuscnt)

select ‘u1′,100,’pending’,20

union all

select ‘u1′,100,’Active’,20

union all

select ‘u1′,100,’Deferred’,60

union all

select ‘u2′,60,’pending’,20

union all

select ‘u2′,60,’Active’,20

union all

select ‘u2′,60,’Deferred’,20

select * from @tbl;

with cte as (

SELECT ROW_NUMBER() OVER(PARTITION BY university ORDER BY university DESC) AS RowID,

*

FROM @tbl

)

SELECT case when rowid=1 then university else null end university,case when rowid=1 then Utotals else null end Utotals,status,statuscnt

FROM cte

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3. I need to view the number of tables existing under one particular Owner. Is it possible? If so, pl give the SQL query for this?

declare @tt table(col1 varchar(10), joinexp varchar(100))

insert into @tt

select ‘c1′,’join table2 on table1.id = table1.id’

union all

select ‘c2′,’join table3 on table2.id = table1.id’

union all

select ‘c3′,’join table4 on table3.id = table1.id’

union all

select ‘c4′,’join table5 on table5.id = table1.id’

union all

select ‘c5′,NULL

union all

select ‘c6′,NULL

declare @str varchar(1000)

set @str = ‘Select c1,c4,c5,c8,c9 from table1′

declare @tt table(col1 varchar(10), joinexp varchar(100))insert into @ttselect ‘c1′,’join table2 on table1.id = table1.id’union allselect ‘c2′,’join table3 on table2.id = table1.id’union allselect ‘c3′,’join table4 on table3.id = table1.id’union allselect ‘c4′,’join table5 on table5.id = table1.id’union allselect ‘c5′,NULLunion allselect ‘c6′,NULL
declare @str varchar(1000)set @str = ‘Select c1,c4,c5,c8,c9 from table1′

Now, in above create dynamic query with dynamic join with the subsequent column from C1,c4 etc.

Ans: Select @str = @str + space(1) + joinexp

from @tt

where CharIndex(col1,@str) > 0 and joinexp <>”

Select @str

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I have two classes XYZ and ABC and two partial classes  of class myClass now is it possible:

partial class myClass : XYZ

{

}

partial class myClass : ABC

{

}

Ans:  This question I have asked in RSystems, Noida and I am sharing hereunder with you :

We can’t inherit two difference classes to partial class because in C# multiple inheritance is not possible using classes.

The main reason is in C# we cant do the following:

class myClass : XYZ, ABC

{

}

It will throw an error while we compile the code.

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declare @dt datetime

set @dt=’1/1/2010′ –Want to know January’s Last Monday Date

SELECT dateadd(d,-datepart(dw,DATEADD(d, -datepart(d,dateadd(mm,1,@dt)),dateadd(mm,1,@dt))-1)+1,DATEADD(d, -datepart(d,dateadd(mm,1,@dt)),dateadd(mm,1,@dt)))

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Can we create a singleton class using public constructor?

Simply answer is yes.

Practically, many of us aware that we can create a singleton class by using private constructor an creating a property, but we can create a singleton class by using public constructor as folows:

static void Main(string[] args)

{

try

{

Singleton obj3 = new Singleton2();

Singleton obj4 = new Singleton2();

Console.Read();

}

catch (Exception ex)

{

Console.WriteLine(ex.ToString());

Console.Read();

}

}

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3. Define Lambda expressions

Left side of this operator specifies the input parameters and contains the expression or statement block at the right side.

Example: myExp = myExp/10;

Now, let see how we can assign the above to a delegate and create an expression tree:

delegate int myDel(int intMyNum);
static void Main(string[] args)
{
//assign lambda expression to a delegate:
myDel myDelegate = myExp => myExp / 10;
int intRes = myDelegate(110);
Console.WriteLine("Output {0}", intRes);
Console.ReadLine();
//Create an expression tree type
//This needs System.Linq.Expressions
Expression<myDel> myExpDel = myExp => myExp /10;
}

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Its just a collection items not child items and are not render while anyone put some html tags. So, its not possible

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A Lambda expression is nothing but an Anonymous Function, can contain expressions and statements. Lambda expressions can be used mostly to create delegates or expression tree types. Lambda expression uses lambda operator => and read as ‘goes to’ operator.

Left side of this operator specifies the input parameters and contains the expression or statement block at the right side.

Example:  myExp = myExp/10;

Now, let see how we can assign the above to a delegate and create an expression tree:

delegate int myDel(int intMyNum);

static void Main(string[] args)

{

//assign lambda expression to a delegate:

myDel myDelegate = myExp => myExp / 10;

int intRes = myDelegate(110);

Console.WriteLine(“Output {0}”, intRes);

Console.ReadLine();

//Create an expression tree type

//This needs System.Linq.Expressions

Expression<myDel> myExpDel = myExp => myExp /10;

}

Note:

The => operator has the same precedence as assignment (=) and is right-associative.

Lambdas are used in method-based LINQ queries as arguments to standard query operator methods such as Where.

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