Error: Invalid expression in the select list (not contained in either an aggregate function or the GROUP BY clause)

Question

I am using Firebird SQL. The below mentioned query returns 4 rows as shown in the figure.

    SELECT a.EPS_ID,b.C_NAME,c.AY_YR_NAME,d.S_NAME,e.E_NAME
FROM 
          


        

Answer 1

Try

SELECT a.EPS_ID,c.AY_YR_NAME,d.S_NAME,e.E_NAME,MAX(b.C_NAME) AS XT ...
GROUP BY 1,2,3,4