求sql，根据记录获取某月数据是否存在

[zzxiaoma]

表1结构如下
id content mdate(varchar2类型)
1 adadfs 2015-01-01
2 dsff 2015-01-03
3 dsgere 2015-01-04
4 kkll 2015-01-31
参数是2015-01 ，想要的结果是存在记录是1，不存在是0.
结果是1,0,1,1,0,0,0,....1

[小灰狼W]

SELECT X.MDATE, CASE WHEN EXISTS (SELECT 1 FROM TABLE1 T1 WHERE T1.MDATE = X.MDATE) THEN 1 ELSE 0 END FLAG FROM (SELECT TO_CHAR(TO_DATE('2015-01' || '-01', 'YYYY-MM-DD') + ROWNUM - 1, 'YYYY-MM-DD') MDATE FROM DUAL CONNECT BY ROWNUM <= ADD_MONTHS(TO_DATE('2015-01' || '-01', 'YYYY-MM-DD'), 1) - TO_DATE('2015-01' || '-01', 'YYYY-MM-DD')) X '2015-01'替换成相应的月份参数

[没什么是无所不能的]

with a as ( select 1 as id, 'adadfs' as content, '2015-01-01' as mdate from dual union all select 2, 'dsff', '2015-01-03' from dual union all select 3, 'dsgere', '2015-01-04' from dual union all select 4, 'kkll', '2015-01-31' from dual ), b as ( select to_char(to_date('2015-01-01','yyyy-mm-dd') + level - 1,'yyyy-mm-dd') as sdate from dual connect by level <= 31 ), c as ( select b.sdate, decode(a.id,null,0,1) as res from a, b where a.mdate(+) = b.sdate order by 1 ) select dbms_lob.substr(wmsys.wm_concat(res),100) as res from c

[没什么是无所不能的]

with a as ( select 1 as id, 'adadfs' as content, '2015-01-01' as mdate from dual union all select 2, 'dsff', '2015-01-03' from dual union all select 3, 'dsgere', '2015-01-04' from dual union all select 4, 'kkll', '2015-01-31' from dual ), b as ( select to_char(to_date('2015-01-01','yyyy-mm-dd') + level - 1,'yyyy-mm-dd') as sdate from dual connect by level <= 31 ), c as ( select b.sdate, decode(a.id,null,0,1) as res from ( select mdate,count(1) as id from a group by mdate ) a, b where a.mdate(+) = b.sdate order by 1 ) select dbms_lob.substr(wmsys.wm_concat(res),100) as res from c 上面的忘了原表可能存在1天有多条记录的情况了

[zzxiaoma]

1楼的输出格式不太对，但是年月比较灵活，2楼是用到31，总是数据31位，也有好处，都不错