列值中获取第一个非空的值

标题是否符合网友的问题宗旨，另外讨论，暂且如此。想了妥解问题，还得看原讨论题。

这是一个网上的问题如下，

;with temp as 
(
    select '63738893' repair_no,'20190504' report_date,'HES2418819040700003'service_sheet_no,null sno,'467769309410' rno union all
    select '63738893' repair_no,'20190504' report_date,'HES2418819040700003'service_sheet_no,'467769309411' sno,null rno union all
    select '63738793' repair_no,'20190508' report_date,'HES2418819040700003'service_sheet_no,'467769309411' sno,null rno
)select * from temp
--以上原始数据
--以下想要的结果
;with temp as 
(
    select '63738893' repair_no,'20190504' report_date,'HES2418819040700003'service_sheet_no,'467769309411' sno,'467769309410' rno union all
    --select '63738893' repair_no,'20190504' report_date,'HES2418819040700003'service_sheet_no,'467769309411' sno,null rno union all
    select '63738793' repair_no,'20190508' report_date,'HES2418819040700003'service_sheet_no,'467769309411' sno,null rno
)select * from temp

Source Code