oracle where 条件中用case

select  
 substr(xoq.item,2,5) model
from xwp_out_quantity xoq
where xoq.vendor='&s_vendor'and (casewhen xoq.vendor='220010'then substr(xoq.item,2,1) elsenullend)=9or  (casewhen xoq.vendor='220020'then substr(xoq.item,2,1) elsenullend)=8or  (casewhen xoq.vendor='220030'then substr(xoq.item,2,1) elsenullend)=7

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