TO_CHAR(ADD_MONTHS(SYSDATE,-1),'YYYY'),TO_CHAR(ADD_MONTHS(SYSDATE,-1),'MM')
TO_CHAR(ADD_MONTHS(SYSDATE,0),'YYYY'),TO_CHAR(ADD_MONTHS(SYSDATE,0),'MM')
TO_DATE('20151231','YYYY-MM-DD') - TO_DATE(ERSDA,'YYYY-MM-DD')
OracleSQL statement time format conversion
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