How to assign 0 to summation of a field if no entry exists for the group by field in teradata SQL query result

Question

I have below query which is used for getting summation of an amount column but as you can see also in the attached screenshot that, there's no entry for NATURAL PERSON for Corporates as there aren't any entry in the table for NATURAL PERSON for CUST_TYPE=Corporates. Please suggest how to get NATURAL PERSON row also for Coporates with 0 assigned against it. Searched for similar questions but didn't get the result with provided suggestions

SELECT CUST_TYPE,FINAL_SME_CATEGORY, SUM(CUST_COMPENSATABLE_AMT) AS TOTAL_SUM FROM  ddewd10s.FSCS_LIMIT_UTIL_SCV WHERE FINAL_SME_CATEGORY IN ('SMALL','NATURAL PERSON') GROUP BY 1,2 ORDER BY 1,2;

I tried few queries with ZEROIFNULL, NVL, COALESCE but all of them also gave the same result. Even tried writing CASE statements still didn't get the desired result.

SELECT CUST_TYPE,FINAL_SME_CATEGORY, COALESCE(SUM(CUST_COMPENSATABLE_AMT), 0) AS TOTAL_SUM FROM  ddewd10s.FSCS_LIMIT_UTIL_SCV WHERE FINAL_SME_CATEGORY IN ('SMALL','NATURAL PERSON') GROUP BY 1,2 ORDER BY 1,2;

SELECT CUST_TYPE,FINAL_SME_CATEGORY, ZEROIFNULL(SUM(CUST_COMPENSATABLE_AMT)) AS TOTAL_SUM FROM  ddewd10s.FSCS_LIMIT_UTIL_SCV WHERE FINAL_SME_CATEGORY IN ('SMALL','NATURAL PERSON') GROUP BY 1,2 ORDER BY 1,2;

SELECT CUST_TYPE,FINAL_SME_CATEGORY, NVL(SUM(CUST_COMPENSATABLE_AMT),0) AS TOTAL_SUM FROM  ddewd10s.FSCS_LIMIT_UTIL_SCV WHERE FINAL_SME_CATEGORY IN ('SMALL','NATURAL PERSON') GROUP BY 1,2 ORDER BY 1,2;

SELECT CUST_TYPE, FINAL_SME_CATEGORY, CASE WHEN SUM(CUST_COMPENSATABLE_AMT)=0 THEN 0 ELSE SUM(CUST_COMPENSATABLE_AMT) END AS TOTAL_SUM FROM  ddewd10s.FSCS_LIMIT_UTIL_SCV WHERE FINAL_SME_CATEGORY IN ('SMALL','NATURAL PERSON') GROUP BY 1,2 ORDER BY 1,2;

Answer 1

first do cross join cust_type and final_sme_catgory.

select distinct cust_type from table cross join
(select distinct final_sme_catgory from table) temp.

After that left join with your group by query and join with cust_type and final_sme_catgory. use nvl function to display total_sum or 0 value. sample query:

with cte cross_table (
 select distinct cust_type from table cross join
    (select distinct final_sme_catgory from table) temp.
),
group_by_result(
--
select cust_type ,final_sme_catgory,sum(value) as total from table group by ust_type ,final_sme_catgory),

select cte.cust_type ,cte.final_sme_catgory,nvl(r.total ,0) as total
from cross_table cte left join group_by_result r on cte.cust_type =r.cust_type 
and cte.final_sme_catgory=r.final_sme_catgory