How to write the equivalent SQL case statement for query given below?

Question

This is my working query:

Query = \"select Cust_Id,Card_Number,Clients_Title,Address_Current,Phone_Number,Mobile_Number from Customer_New Where 1=1\";
try
{
         


        

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)

Answer 2

I think you just want this - no CASE required:

SELECT Cust_Id, Clients_Title, Card_Number, Key_Person, Address_Current, Phone_Number, Mobile_Number, AreaLocation
FROM Customer_New
    WHERE
      (@Clients_Title = '' OR Clients_Title LIKE '%'+@Clients_Title+'%') AND
      (@Address_Current = '' OR Address_Current LIKE '%'+@Address_Current+'%') AND
      (@Phone_Number = '' OR Phone_Number LIKE '%'+@Phone_Number+'%') AND
      (@Mobile_Number = '' OR Mobile_Number LIKE '%'+@Mobile_Number+'%') AND
      (@AreaLocation = '' OR AreaLocation LIKE '%'+@AreaLocation+'%')

Because that at least closely resembles your non-SQL code.