oracle集锦

1.decode的用法：

(select max(DECODE(logicSn,null,physicalid+1,logicSn+1)) from m_logic_channel where physicalid=#{physicalId}),

2.nvl的用法：

(select nvl(max(t.logicSn),0)+1 as num from m_logic_channel t),

原文：http://www.cnblogs.com/dashen/p/4317916.html