日期:2014-05-17 浏览次数:20936 次
with t as( select 1 A,2 B from dual union all select null,3 from dual union all select 4,null from dual )select nvl(A,B) from t NVL(A,B) ---------- 1 3 4 ------解决方案-------------------- 2中简单方法
nvl(A,B) decode(A,null,B,A)