Group rows while excluding null values on specific column and aggregating another - sql

Question

I have a table like this
CUSTOMER_ID
ALIAS_ID
ULTIMATE_NAME
MODEL_SUB_TYPE
OLD_PD
OLD_EXP
OLD_ECAP
RATING
Client A
123
Company A
CI_COM_KN
1
1
1
BB+
Client A
123
Company A
CI_POL_KN
0.5
1
1
null
Client A
456
Company B
CI_COM_KN
1
1
3
BB+
Client A
456
Company B
CI_POL_KN
0.5
1
3
null
What I need my query to do is to ignore the values in OLD_PD, OLD_EXP and RATING columns when MODEL_SUB_TYPE = Sub_type B, and aggregate (sum) the OLD_ECAP column regardless of MODEL_SUB_TYPE.
What I have so far is this:
SELECT
CUSTOMER_ID,
ALIAS_ID,
SUBSTR(ULTIMATE_NAME, 0, 70) as ULTIMATE_NAME,
MODEL_SUB_TYPE,
CASE
WHEN MODEL_SUB_TYPE LIKE 'CI_COM_%' THEN ULTIMATE_POD
END AS OLD_PD,
SUM(
CASE
WHEN MODEL_SUB_TYPE LIKE 'CI_COM_%' THEN CREDIT_LIMIT_NET_EXPOSURE
END
) AS OLD_EXP,
SUM(EC_CONSUMPTION_ND) AS OLD_ECAP,
ULTIMATE_RATING AS RATING
FROM
CALC6619.SO_REPORTING -- OLD QUARTER --
WHERE
MODEL_TYPE LIKE 'IR'
AND MODEL_SUB_TYPE LIKE 'CI_%'
AND CUSTOMER_ID = '09781C1 01' -- Customer ID
GROUP BY
CUSTOMER_ID,
ALIAS_ID,
ULTIMATE_NAME,
MODEL_SUB_TYPE,
ULTIMATE_POD,
ULTIMATE_RATING
What I want is my query to return a table like this (based on table above):
CUSTOMER_ID
ALIAS_ID
ULTIMATE_NAME
MODEL_SUB_TYPE
OLD_PD
OLD_EXP
OLD_ECAP
RATING
Client A
123
Company A
CI_COM_KN
1
1
2
BB+
Client A
456
Company B
CI_COM_KN
1
1
6
BB+
But it's actually returning a table like the first one, but with null values where it's supposed to be, but not grouping the rows per company ID, like so:
CUSTOMER_ID
ALIAS_ID
ULTIMATE_NAME
MODEL_SUB_TYPE
OLD_PD
OLD_EXP
OLD_ECAP
RATING
Client A
123
Company A
CI_COM_KN
1
1
1
BB+
Client A
123
Company A
CI_POL_KN
null
null
1
null
Client A
456
Company B
CI_COM_KN
1
1
3
BB+
Client A
456
Company B
CI_POL_KN
null
null
3
null

Answer 1

You just have to remove the columns from group by and do some changes in SELECT clause as follows:
SELECT
CUSTOMER_ID,
ALIAS_ID,
SUBSTR(ULTIMATE_NAME, 0, 70) as ULTIMATE_NAME,
MAX(CASE WHEN MODEL_SUB_TYPE LIKE 'CI_COM_%' THEN MODEL_SUB_TYPE END) AS MODEL_SUB_TYPE,
SUM(CASE
WHEN MODEL_SUB_TYPE LIKE 'CI_COM_%' THEN ULTIMATE_POD
END) AS OLD_PD,
SUM(
CASE
WHEN MODEL_SUB_TYPE LIKE 'CI_COM_%' THEN CREDIT_LIMIT_NET_EXPOSURE
END
) AS OLD_EXP,
SUM(EC_CONSUMPTION_ND) AS OLD_ECAP,
MAX(ULTIMATE_RATING) AS RATING
FROM
CALC6619.SO_REPORTING -- OLD QUARTER --
WHERE
MODEL_TYPE LIKE 'IR'
AND MODEL_SUB_TYPE LIKE 'CI_%'
AND CUSTOMER_ID = '09781C1 01' -- Customer ID
GROUP BY
CUSTOMER_ID,
ALIAS_ID,
SUBSTR(ULTIMATE_NAME, 0, 70)