how update date value in oracle



I need to convert date format in ORACLE SQL Developer

The current format is yyyy/mm/dd-hh:mm:ss:sss and I need to convert it to yyyy-mm-dd hh:mm:ss CST
I don’t really know SQL but did some research.
Here is the command that I consultanted other people on the forum. but it throws me unrecognized command error. table name is B and column name is First

set First = concat(to_char(substring(FIRST,1,4) + '-' + substring(FIRST, 6, 2) + '-' + substring(FIRST, 9, 2) + ' ' + substring(FIRST, 12, 8));

Could anyone here help me with it? thanks in advance.






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