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Order_Auto CUST_NO  
SL2009110001 SLM23
SL2009110002 SLM21
SL2009100001 SLQ01
SL2009100003 SLW02
Order_AutoµÄ×é³ÉÊÇÓÉ CUST_NOµÄֵǰÁ½Î»¼ÓÉÏÄêÔÂÒÔ¼°ËÄλÁ÷Ë®ºÅ×é³É£¬£¨cust_noµÄÖµÊDZ䶯µÄ£©
µ± cust_noǰÁ½Î»ÖµÊÇSLʱ£¬
Èç¹ûµ±Ç°ÊÇ09Äê9ÔÂʱ£¬ ÒªÇóµÃµ½ SL2009090001
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Èç¹ûµ±Ç°ÊÇ09Äê11ÔÂʱ£¬ÒªÇóµÃµ½ SL2009110003
µ± cust_noǰÁ½Î»ÖµÊÇDEʱ£¬
Èç¹ûµ±Ç°ÊÇ09Äê9ÔÂʱ£¬ ÒªÇóµÃµ½ DE2009090001
Èç¹ûµ±Ç°ÊÇ09Äê10ÔÂʱ£¬ÒªÇóµÃµ½ DE2009100001
Èç¹ûµ±Ç°ÊÇ09Äê11ÔÂʱ£¬ÒªÇóµÃµ½ DE2009110001
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select * from [table] where substr(order_auto,3,6)=to_str(sysdate,'yyyymm');

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SQL code:
With a As
(Select 'SL2009110001' oa ,'SLM23' cn from dual Union All
Select 'SL2009110002' oa , 'SLM21' from dual
Union All
Select 'SL2009100001' oa , 'SLQ01' from dual
Union All
Select 'SL2009100003' oa , 'SLW02' from dual
Union All
Select 'DE2010030003' oa , 'DEW02' from dual)
Select Distinct cn1, t.cn1 || to_char(Sysdate,'YYYYMM')|


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