比如物料名称选择小径杂木和小径杨木，挂牌价就是小径杂木一级、二级两个数与小径杨木一级、二级两个数，共4个数之和再除以4。随着选择物料名称不同，显示的数也会有变化。
AVG不对？还是数据库没avg()?
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SELECT wldj,AVG(MATERIAL_PRICE) [AVG_] FROM TABLE WHERE 1=1 ${len(控件名称)==0,""," and wlmc in ('"+控件名称+"')"} group by wldj
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