SELECT
    AVG(Max_equation_number) AS avg_equation_number,
    tbl_categories_id
FROM
    (
    SELECT
        *,
        MAX(equation_number) AS Max_equation_number
    FROM tbl_risk_bia_relationship where tbl_risk_assessment_id=3106 GROUP BY name,tbl_categories_id 
    ORDER BY
    tbl_categories_id ASC
        
    ) as AssetRegisterCategortyAVG
    
    where tbl_risk_assessment_id=3106
    
    GROUP BY
    tbl_categories_id

    ;