月份統計

 select sum(decode(a.mm,'01',num,0)) m1 ,         sum(decode(a.mm,'02',num,0)) m2,         sum(decode(a.mm,'03',num,0)) m3,         sum(decode(a.mm,'04',num,0)) m4,         sum(decode(a.mm,'05',num,0)) m5,         sum(decode(a.mm,'06',num,0)) m6,         sum(decode(a.mm,'07',num,0)) m7,         sum(decode(a.mm,'08',num,0)) m8,         sum(decode(a.mm,'09',num,0)) m9,         sum(decode(a.mm,'10',num,0)) m10,         sum(decode(a.mm,'11',num,0)) m11,         sum(decode(a.mm,'12',num,0)) m12,         sum(num)         from (select count(1) num,                              to_char(m.optdate, 'MM') mm           FROM czrzb M          group by to_char(m.optdate, 'MM')) A