Solve the problem that the time format of manually querying Oracle database is incorrect (date type)

When writing code , It is often first to use visual tools to query the database for testing , Then write code according to the query statement

When the database is used Oracle And there are DATE Type , Will use string conversion DATE Function of TO_DATE(ch, fmt)

If fmt( The format of the date ） Use yyyy-MM-dd HH:mm:ss

for example :TO_DATE('2020-05-20 13:14:20' , 'yyyy-MM-dd HH:mm:ss') 

In this way, mistakes will occur ： ORA-01810: The format code appears twice

resolvent ：

        take mm Change it to mi, The detailed method is as follows

Using functions TO_DATE(ch, fmt)

ch： Input time ( character string )

fmt： The format of the date

        12 hourly ：yyyy-MM-dd HH:mi:ss

        24 hourly ：yyyy-MM-dd HH24:mi:ss

for example ：TO_DATE('2020-05-20 13:14:20' , 'yyyy-MM-dd HH24:mi:ss')