postgre数据清洗

select
    "BATCH_NUMBER" as batchNumber,
    count(1) as applyNum
from (
     select
         "BATCH_NUMBER"
     from (
            select
              "BATCH_NUMBER",
               row_number() over(partition by  "PT_NAME","BATCH_NUMBER","POLICY_NAME") as rown
            from syc_industry_support_policy where data_status='1' and "STAT"='申请成功' and "BATCH_NUMBER" like
            (to_char((SELECT now()::timestamp),'yyyy')||'%')
     ) t where t.rown=1
)t1 group by "BATCH_NUMBER"
order by cast( "BATCH_NUMBER" as numeric) desc

来源：https://my.oschina.net/goudingcheng/blog/3133487