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improve the perfomance?

 
du sixiang
Greenhorn
Posts: 3
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select c.cus_cust_no,sum(o.totalpay) as sum_total from customer c,orders v where c.cus_cust_no=v.ord_cust_no ;
the sql String can perfom,but the velocity is so so slowly...?
how can i do something to improve it ?
 
It is sorta covered in the JavaRanch Style Guide.
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