本文提供了一个SQL查询案例，展示了如何从多个表中选择特定的数据，并通过使用not in子句排除已经存在的纳税人与地块关系。
select * from (select t2.cadastralno parcelid,t1.pkid taxpayerid,t2.taxtype taxtype,t1.booktype taxpayertype,
t2.cadastralno parcelCadastralno,t2.landuser parcelLanduser,t1.payername taxpayerPayername
from grid_sysdb.bss_taxpayers t1,grid_sysdb.bbs_parcel t2,grid_sysdb.djsw_tddjxx t3
where t3.nsrdzdah = t1.pkid and t1.payername = t2.landuser)
t2.cadastralno parcelCadastralno,t2.landuser parcelLanduser,t1.payername taxpayerPayername
from grid_sysdb.bss_taxpayers t1,grid_sysdb.bbs_parcel t2,grid_sysdb.djsw_tddjxx t3
where t3.nsrdzdah = t1.pkid and t1.payername = t2.landuser)
where (parcelid,taxpayerid) not in(select p.parcelid,p.taxpayerid from bss_parceltaxpayerrel p)
not in多个字段
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