Question

I need some help in SQL Server

I have a number of table rows like below.

ID   Name          status  
1    viral/AHD     Yes  
2    viral/AHD     No  
3    joe/US        Yes  
4    thomas/IND    Yes   
5    jack/IND      No  

Now I want to select those rows which are distinct in Name column, that is the 3rd, 4th, 5th and those rows which are duplicate in Name but status is Yes..

So my final answer would be like this:

ID   Name          Status  
1    viral/AHD     Yes  
3    joe/US        Yes  
4    thomas/IND    Yes  
5    jack/IND      No 

Answer 1

If you are using sql 2005+. Then this might help:

;WITH CTE
AS
(
    SELECT
        ROW_NUMBER() OVER(PARTITION BY Name 
                     ORDER BY 
                    (CASE WHEN status='Yes' THEN 0 ELSE 1 END)) AS RowNbr,
        Table1.*
    FROM
        Table1
)
SELECT
    *
FROM
    CTE
WHERE
    CTE.RowNbr=1

EDIT

Or even simpler. Like this:

;WITH CTE
AS
(
    SELECT
        ROW_NUMBER() OVER(PARTITION BY Name 
                    ORDER BY status DESC) AS RowNbr,
        Table1.*
    FROM
        Table1
)
SELECT
    *
FROM
    CTE
WHERE
    CTE.RowNbr=1

Useful references:

• OVER Clause (Transact-SQL)
• WITH common_table_expression (Transact-SQL)