统计过去一年数据，按12月展示，为0 的数据也展示

Posted 2020-09-14 Marco2752

第一种方法

按每个月统计出一行数据，然后再行专列。

select decode(counttime,\'NUMS01\',to_char(add_months(sysdate,0),\'mm\'),\'NUMS02\',to_char(add_months(sysdate,-1),\'mm\'),\'NUMS03\',to_char(add_months(sysdate,-2),\'mm\'),\'NUMS04\',to_char(add_months(sysdate,-3),\'mm\'),\'NUMS05\',to_char(add_months(sysdate,-4),\'mm\'),\'NUMS06\',to_char(add_months(sysdate,-5),\'mm\'),\'NUMS07\',to_char(add_months(sysdate,-6),\'mm\'),\'NUMS08\',to_char(add_months(sysdate,-7),\'mm\'),\'NUMS09\',to_char(add_months(sysdate,-8),\'mm\'),\'NUMS10\',to_char(add_months(sysdate,-9),\'mm\'),\'NUMS11\',to_char(add_months(sysdate,-10),\'mm\'),\'NUMS12\',to_char(add_months(sysdate,-11),\'mm\'),\'NUMS011\',to_char(add_months(sysdate,-10),\'mm\'),counttime) counttime, trunc(countdata/100,2) countdata from (
select nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,0),\'mm\'),column,0)),0) nums01,nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-1),\'mm\'),column,0)),0) nums02,
       nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-2),\'mm\'),column,0)),0) nums03,nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-3),\'mm\'),column,0)),0) nums04, 
       nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-4),\'mm\'),column,0)),0) nums05,nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-5),\'mm\'),column,0)),0) nums06,
       nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-6),\'mm\'),column,0)),0) nums07,nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-7),\'mm\'),column,0)),0) nums08,
       nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-8),\'mm\'),column,0)),0) nums09,nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-9),\'mm\'),column,0)),0) nums10,
       nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-10),\'mm\'),column,0)),0) nums11,nvl(sum(decode(to_char(commitdatetime,\'mm\'),to_char(add_months(sysdate,-11),\'mm\'),column,0)),0) nums12
           from tablename 
           where commitdatetime > to_date(to_char(add_months(sysdate,-12),\'yyyy-mm\')||\'-1 00:00:01\',\'yyyy-mm-dd hh24:mi:ss\')
           )  unpivot (countdata for counttime in (nums01,nums02,nums03,nums04,nums05,nums06,nums07,nums08,nums09,nums10,nums11,nums12) )

第二种方法，先按月统计生成12行2列

select to_char(commitdatetime,\'yyyy-mm\') countdate,trunc(sum(countcolumn)/10000,2) countarea from tablename where commitdatetime > to_date(to_char(add_months(sysdate,-12),\'yyyy-mm\')||\'-1 00:00:01\',\'yyyy-mm-dd hh24:mi:ss\')  group by to_char(commitdatetime,\'yyyy-mm\') order by to_char(commitdatetime,\'yyyy-mm\')

这样统计，为0或者为空的数据将不会出来，接着就是把没有数据的月份也显示出来即可，方法如下

select to_char(add_months(sysdate,1-level),\'yyyy-mm\') from dual connect by level<13

先构造12个月的数据，然后建这个数据左连接刚才统计的表就可以出来想要的数据了。

select t1.rn, t1.cmonth countdate, nvl(t2.countarea,0) countarea from (
select to_char(add_months(sysdate,1-level),\'yyyy-mm\') cmonth,rownum rn from dual connect by level<13 ) t1 left join 
(select to_char(commitdatetime,\'yyyy-mm\') countdate,trunc(sum(buildarea)/10000,2) countarea from trade_stat_brinfo where commitdatetime > to_date(to_char(add_months(sysdate,-12),\'yyyy-mm\')||\'-1 00:00:01\',\'yyyy-mm-dd hh24:mi:ss\')  group by to_char(commitdatetime,\'yyyy-mm\') order by to_char(commitdatetime,\'yyyy-mm\')) t2 on t1.cmonth = t2.countdate
order by t1.rn