How to write an sqlite query for the following scenario? [duplicate] - sql

Question

This question already has answers here:
How to write the equivalent SQL case statement for query given below?
(2 answers)
Closed 8 years ago.
Here is my query for wpf form
Query = "select Cust_Id,Card_Number,Clients_Title,Address_Current,Phone_Number,Mobile_Number from Customer_New Where 1=1";
try
{
if (txt_title.Text != "")
Query += " and Clients_Title Like '%" + txt_title.Text + "%'";
if (txt_address.Text != "")
Query += " and Address_Current Like '%" + txt_address.Text + "%'";
if (txt_phone.Text != "")
Query += " and Phone_Number Like '%" + txt_phone.Text + "%'";
if (txt_mobile.Text != "")
Query += " and Mobile_Number Like '%" + txt_mobile.Text + "%'";
if (cbo_location.Text != "")
Query += " and AreaLocation Like '%" + cbo_location.Text + "%'";
}
catch { }
I want to report viewer query data like my wpf form .
Here is the query that i am trying in report viewer
SELECT Cust_Id, Clients_Title, Card_Number, Key_Person, Address_Current, Phone_Number, Mobile_Number, AreaLocation
FROM Customer_New
WHERE (Clients_Title = #Clients_Title) OR
(Address_Current = #Address_Current) OR
(Phone_Number = #Phone_Number) OR
(Mobile_Number = #Mobile_Number) OR
(AreaLocation = #AreaLocation)
Can anyone tell me query for report viewer like wpf form .
Note :-
I cant use cant use C# controls in report viewer.Here in report
viewer i can only use sql
What is needed in report viewers query is:
When are all string of where clause are null then my report viewer
should select query is:
Query = "select Cust_Id,Card_Number,Clients_Title,Address_Current,Phone_Number,Mobile_Number from Customer_New ";
When any two string of where clause are not matching corresponding
row db then nothing
will be displayed
Lastly, selection will be made if just one condition of where clause
is provided

Answer 1

SELECT Cust_Id, Clients_Title, Card_Number, Key_Person, Address_Current, Phone_Number, Mobile_Number, AreaLocation
FROM Customer_New
where (CASE
WHEN #Clients_Title != '' THEN Clients_Title=#Clients_Title
ELSE
NULL IS NULL
END)
AND(CASE
WHEN #Address_Current != '' THEN Address_Current =#Address_Current
ELSE
NULL IS NULL
END)
AND(CASE
WHEN #Phone_Number != '' THEN Phone_Number=#Phone_Number
ELSE
NULL IS NULL
END)
AND(CASE
WHEN #Mobile_Number != '' THEN Mobile_Number=#Mobile_Number
ELSE
NULL IS NULL
END)
AND(CASE
WHEN #AreaLocation != '' THEN AreaLocation =#AreaLocation
ELSE
NULL IS NULL
END)