oracle 统计sql
oracle 统计月平均交易次数 ：
select n_tsc_src_usr_id , floor(count(c_tsc_no)/trunc(months_between(max(d_tsc_req_time),min(d_tsc_req_time))))
from tbl_tsc_base
group by n_tsc_src_usr_id
having months_between(max(d_tsc_req_time),min(d_tsc_req_time)) >=1
oracle 日交易统计：
select *
from (select rownum rn, r.*
from (select to_char(to_date(substr(txn_tm, 0, 8), 'yyyy-mm-dd'),
'yyyy-mm-dd') as txn_date,
sum(txn_amt) as txn_amt_sum,
count(1) as txn_count,
-sum(MERC_FEE_AMT) txn_fee_sum
from HPSTJNL
where merc_id = '800000370110002'
and txn_cd = 2010020
group by substr(txn_tm, 0, 8)
order by txn_date desc) r)
where rn >= 1
and rn < 16
oracle 统计总行数：
select count(1)
from (select count(1)
from HPSTJNL
where merc_id = '800000370110002'
and txn_cd = 2010020
group by substr(txn_tm, 0, 8))
最近一个月的统计信息：
and to_char(to_date(txn_tm,'yyyy-mm-dd hh24:mi:ss'), 'yyyymmdd') between to_char(add_months(sysdate,-1),'yyyymmdd') and to_char(trunc(sysdate), 'yyyymmdd')
上一个月的统计信息: txn_tm字段格式：20120314102320
substr(txn_tm,0,6) = to_char(add_months(sysdate,-1),'yyyymm')