ORA-01861: 文字与格式字符串不匹配---解决办法

往oracle中插入时间  \'2007-12-28 10:07:24\'
如果直接按照字符串方式，或者，直接使用to_date(\'2007-12-28 10:07:24\'）,没有指定日期格式，就会报错：ORA-01861: 文字与格式字符串不匹配
必须指定日期格式 
to_date(\'2007-12-28 10:07:24\' , \'yyyy-mm-dd hh24:mi:ss\')

/* Formatted on 2019/10/10 09:17:55 (QP5 v5.252.13127.32847) */
SELECT    TO_CHAR (TO_DATE (\'2019-10-10\', \'yyyy-mm-dd\'), \'YY\')
       || (CASE
              WHEN TO_CHAR (
                      NEXT_DAY (TO_DATE (\'2019-10-10\', \'yyyy-mm-dd\'),
                                \'星期日\'),
                      \'YYYY\') <>
                      TO_CHAR (TO_DATE (\'2019-10-10\', \'yyyy-mm-dd\'), \'YYYY\')
              THEN
                 \'01\'
              WHEN TO_CHAR (TO_DATE (\'2019-10-10\', \'yyyy-mm-dd\'), \'D\') = \'1\'
              THEN
                 TO_CHAR (TO_DATE (\'2019-10-10\', \'yyyy-mm-dd\') + 1, \'IW\')
              ELSE
                 TO_CHAR (TO_DATE (\'2019-10-10\', \'yyyy-mm-dd\'), \'IW\')
           END)
          AS YearWeek
  FROM DUAL