両方に明確な結果が必要な場合はunionを使用でき、重複した結果が必要な場合はunionallを使用できます
SELECT CustID
, DateSubmitted
, Type
, Points
FROM `trans_summary`
WHERE CustID = '10009'
UNION
SELECT CustID
, DateSubmitted
, Type
, PointTotal
FROM `ptrans_detail`
WHERE CustID = '10009'
and DateSubmitted NOT IN
(SELECT DateSubmitted FROM
`trans_summary`
WHERE CustID = '10009')
または、必要に応じてすべてを結合して結果を複製します
SELECT CustID
, DateSubmitted
, Type
, Points
FROM `trans_summary`
WHERE CustID = '10009'
UNION ALL
SELECT CustID
, DateSubmitted
, Type
, PointTotal
FROM `ptrans_detail`
WHERE CustID = '10009'
and DateSubmitted NOT IN
(SELECT DateSubmitted FROM
`trans_summary`
WHERE CustID = '10009')