ORA-01861: 文字与格式字符串不匹配;literal does not match format string;

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问题描述: 保存系统当前时间,精确到时分秒

错误sql

time date类型字段
update t_table SET time = to_char(sysdate，'yyyy-MM-dd HH24:mi:ss')

报错信息: ORA-01861: 文字与格式字符串不匹配

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处理方式:

select sysdate from dual;
select to_date(sysdate) from dual;
select to_char(sysdate) from dual;

2018-12-15 16:07:35
2018-12-15 00:00:00
15-DEC-18

下面的写法有区别:

update t_table SET time = to_date(to_char(sysdate)，'yyyy-MM-dd HH24:mi:ss') 
update t_table SET time = to_date(to_date(sysdate)，'yyyy-MM-dd HH24:mi:ss') 
update t_table SET time = to_date(sysdate，'yyyy-MM-dd HH24:mi:ss') 
update t_table SET time = to_date (
(select to_char(sysdate,'yyyy-MM-dd HH24:mi:ss') from dual), 
'yyyy-mm-dd hh24:mi:ss')
update t_table SET time =(select sysdate from dual)

15-12-18 00:00:00
15-12-18 00:00:00
15-12-18 00:00:00
2018-12-15 16:07:35
2018-12-15 16:07:35