sql Server 查询优化

t_FSHH_PartitionInfo表大概有10多万条数据，RdRecords大概3万条数据，刚开始使用如下语句执行时，大概耗时2分钟

Select p.* From t_FSHH_PartitionInfo p Where p.cLineID=2 and p.dQCVoucherDate Between '2016-03-01 00:00:00' And '2016-03-31 23:59:59' And
(
isnull(p.bReturn,'否')='是' or  exists(
Select d.cdefine28 As cBarcode  From RdRecords d  Where p.cBarcode=d.cdefine28
group By  d.cdefine28
)
)

select p.* from t_FSHH_PartitionInfo p
Where p.cLineID=2 and p.dQCVoucherDate Between '2016-03-01 00:00:00' And '2016-03-31 23:59:59' And
isnull(p.bReturn,'否')='是'
Union All
Select p.* From t_FSHH_PartitionInfo p Where p.cLineID=2 and isnull(p.bReturn,'否')!='是'
And
exists(
Select d.cdefine28 As cBarcode  From RdRecords d Where p.cBarcode=d.cdefine28 --and r.dDate Between '2016-03-28 00:00:00' And '2016-03-28 23:59:59'
group By  d.cdefine28
)