I Am Having QUERY/ DATASET Problem With SQL Reports.

Hi every1,



I really need your help.



I have a web form which is having Drop Down box in which I have 2 selection 'P' and 'C'. Depending upon the selection I have to call the Dataset( If I can make it in code behind) or I can do it in one Complex query if you guys will help me.



Query should be like this.

select a.* , case when selection='P' then select p.column1 from ptable p

case when selection='C' then select c.column1 from ctable c

else a.column1

from atable a

where

acolumn2 = "USERINPUT"



but now the problem is in FROM and Where Clause.

when selection is 'P' then I have to include ptable in FROM Clause and in where clause I have to include two condition like (p.column1 = a.column1 and p.column2="USERINPUT1" or

if selection is 'C' then I have to include ctable in FROM clause and in where clause I have to include two different condition like (c.column1 = a.column1 and c.column2="USERINPUT")



So at once the Query will be any of one like below:

(1) some times this:

select a.* , case when selection='P' then select p.column1 from ptable p

case when selection='C' then select c.column1 from ctable c

else a.column1

from atable a, ptable p

where

a.column2 = "USERINPUT" and

p.column1 = a.column1 and p.column2="USERINPUT1"



----------------------------

(2) some times this:

select a.* , case when selection='P' then select p.column1 from ptable p

case when selection='C' then select c.column1 from ctable c

else a.column1

from atable a, ctable c

where

a.column2 = "USERINPUT" and

c.column1 = a.column1 and c.column2="USERINPUT"



Please let me know if you have any kind of confusion so I can clear this but if you got everything from my description please do help me to solve this. I am really struggling for this.



One way I was thinking to generate 3 dataset one(query or dataset) for 'P' , one for 'C' and one for else so I can get the input (selection) from the form and then decide in codebehind which dataset I have to make call so no need to write complex query. But this is my thought and I dont know how to make a call and everything either so please help me in this as well, if you like this solution .



Or try to solve the above query please.



Thanks

Roy