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分析関数[[lag()](http://oracle.se-free.com/dml/0601_lag.html)]が使えます。
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```SQL
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SELECT SEIHIN, SAGYODATE, SEQ, NAIYO
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, lag(SAGYODATE) over(partition by seihin order by SAGYODATE, SEQ) AS SAGYODATE2
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, lag(SEQ) over(partition by seihin order by SAGYODATE, SEQ) AS SEQ2
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FROM
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FROM SAGYORIREKI
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WHERE
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WHERE SAGYODATE BETWEEN TO_DATE('2017/06/01','YYYY/MM/DD')
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AND TO_DATE('2018/11/30','YYYY/MM/DD')
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```
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