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--ÈÕÆÚת»»ºÁÃë
SELECT TO_NUMBER(TO_DATE('2005-03-29 12:30:45', 'YYYY-MM-DD HH24:MI:SS') -
TO_DATE('1970-01-01 8:0:0', 'YYYY-MM-DD HH24:MI:SS')) * 24 * 60 * 60 * 1000
from DUAL;

--ºÁÃëת»»ÈÕÆÚ
SELECT TO_CHAR(1112070645000 / (1000 * 60 * 60 * 24) +
TO_DATE('1970-01-01 08:00:00', 'YYYY-MM-DD HH:MI:SS'), 'YYYY-MM-DD HH:MI:SS') AS CDATE
from DUAL;


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select emp_card_no,work_date,read_card_date,count(rownum) as cnt
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MERGE <hint> INTO <table_name>
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WHEN MATCHED THEN <update_clause>
WHEN NOT MATCHED THEN <insert_clause>;
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