The following table:
First use str_to_datefunction to convert its varchar type For the date type, then sort from small to large
Syntax: select str_to_date(class_time,'%Y%m%d %H:%i:% s') a from a order by a desc ;
Let’s take a look at the date format conversion of varchar type in Oracle to date type
Varchar type date format conversion date type in oracle
SELECT to_char(to_date(m.ma_datetime,'yyyy-MM-dd hh24:mi:ss'), 'yyyyMMdd') FROM my_task m;
m.ma_datetime is a varchar2 type date format, first convert the date type
( Hours, minutes and seconds must be added, otherwise ora-01830 error will be reported)
Then convert it to varchar type as you like
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