Oracle Varchar2 DateTime Experassions - yyyy-mm-dd HH24:MI:SS

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There is a verchar2 Date Time Filed  in the table which now need to get Results with the given rnage


eg : up to 3 days of the past from today.

Eg Field DONE_TIME


SELECT  * substr(DONE_TIME,0,19) FROM EG_TABLE

Convert to date :

SELECT  *  TO_DATE(substr(DONE_TIME,0,19),'yyyy-mm-dd HH24:MI:SS') FROM EG_TABLE

Reduce From the System Time :

SELECT  *  (systimestamp-TO_DATE(substr(substr(DONE_TIME,0,19),0,19), 'yyyy-mm-dd HH24:MI:SS')) FROM EG_TABLE


RANGE Comparison  :

WHERE trunc(to_number(substr((systimestamp-TO_DATE(substr(substr(DONE_TIME,0,19),0,19), 'yyyy-mm-dd HH24:MI:SS')),1,instr(systimestamp-TO_DATE(substr(substr(DONE_TIME,0,19),0,19), 'yyyy-mm-dd HH24:MI:SS'),' '))))>3


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