oracle case when及decode的用法
case ... when 语句 1) CASE column_name WHEN value1 THEN resutl1,... [ ELSE result ] END select ...
case ... when 语句 1) CASE column_name WHEN value1 THEN resutl1,... [ ELSE result ] END select ...
工作中有需求要将如下结构的数据(为方便处理数据类型均为字符换): ID DATE VALUE a 2016-10-01 ...