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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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connect internal/oracle AS SYSDBA ;(scott/tiger)
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lsnrctl stop
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net start oracleservicesid
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net stop oracleservicesid
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CREATE TABLE student (
xh number primary key,
Name varchar2(10) not null);
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CREATE SEQUENCE student_seq
START WITH 1
INCREMENT BY 1
NOCACHE;
°´»Ø³ ......
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MERGE <hint> INTO <table_name>
USING <table_view_or_query>
ON (<condition>)
WHEN MATCHED THEN <update_clause>
WHEN NOT MATCHED THEN <insert_clause>;
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Multitable inserts allow a single INSERT INTO .. SELECT statement to ......
select custid,carid,Cunote,INVNO,BUYPLAN
from ( select custid,carid,Cunote,INVNO,BUYPLAN,
row_number() over(partition by custid,carid order by Feedbackid desc) rn
from pvE3S.T_VCTM_CUSTOMER_FEEDBACK) t1 where rn=1
°´Feedbackid ÅÅÐò,rnÊÇǰNÐÐ ......