数据库报ORA-01839的错误
ZCGL数据库在运行SQL语句的时候报:ORA-01839 指定月份的日期无效
【问题描述】ZCGL数据库在运行SQL语句的时候报:ORA-01839 指定月份的日期无效
详细的SQL语句简化如下:
select *
from table_name
where to_date(a.yc_date,'yyyy-mm-dd')-sysdate>1
【问题的原因】ORA-01839表明z_yc_date的结果集的日期有不符合相应的日期标准,常见的有
select to_date('2015/2/31','yyyy/mm/dd') from dual;
因为2月没有31号,所以就会报ORA-01839的错误;
【解决方法】针对这个错误问题有两个解决方法:
1、找出源数据中,不符合规范的日期(已把结果集导出但并没有发现很明显的错误);
2、改写相应的SQL语句,,改写如下
select * from table_name
where ya.c_date>=to_char(sysdate,'yyyy-mm-dd')) #通过字符型去比较
【总结】以上的问题其实可以在建表的时候就进行规避,建议是用来存放时间日期的列,建议在创建表的时候直接设置该列的类型为date,对于后续的管理和性能都是有很大的好处;
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