Question

I want to know, if I can perform such operation. I have following data arrangement in table:

id SessionId P_Name P_TypeId
1  abc        XYZ   5
2  abc        XYZ   5
3  abc        XYZ   5
4  abc        XYZ   5
5  abc        XYZ   5
6  abc        XYZ   5
7  abc        XYZ   5  
8  abc        XYZ   5

Here I have 8 similar items, but have unique Ids.

Condition:

From frontend i will pass [P_TypeId] = 5 and the query will then remove only one item from the table using a delete statement. Is this possible?

Answer 1

Yes, for example using ROW_NUMBER:

WITH x 
     AS (SELECT id, 
                sessionid, 
                p_name, 
                p_typeid, 
                RN = Row_number() 
                       OVER( 
                         partition BY sessionid, p_name, p_typeid 
                         ORDER BY id) 
         FROM   dbo.tablename
         WHERE P_TypeId = @P_TypeId ) 
DELETE x 
WHERE  rn = 1 

Deletes the lowest id of each group.

DEMO