NVL進階版函式
select Coalesce('C','B','A') from dual ==> C
select Coalesce(null,'B','A') from dual ==> B
select Coalesce(null,null,'A') from dual ==> A
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NVL進階版函式
select Coalesce('C','B','A') from dual ==> C
select Coalesce(null,'B','A') from dual ==> B
select Coalesce(null,null,'A') from dual ==> A