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Remove Oracle manually

Get ORACLE current version, use :
SELECT *
   FROM  v$version;

Get The First Day of the Year for a given date SELECT TRUNC(sysdate,'Y') FROM DUAL

Get The First Day of the month for a given date SELECT TRUNC(sysdate,'MM') FROM DUAL

Get the First Day of the quarter for a given date SELECT TRUNC(sysdate,'Q') FROM DUAL

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