Oracle中日期转换报"输入值对于日期格式长度不够"解决

[sql] 
select (select j.jgmc from t_zzjg j where j.jgdm = t.jgdm) jgmc,  
       t.jgdm,  
       sum(t.jcj) jcj,  
       sum(t.sa) sa,  
       sum(t.la) la,  
       sum(t.ajbl) ajbl,  
       sum(t.xsqzcs) xsqzcs,  
       sum(t.sacw) sacw,  
       sum(t.jgzx) jgzx,  
       sum(t.zfgz) zfgz,  
       sum(t.jjclaj) jjclaj,  
       sum(t.zs) zs  
  from t_fxyp_zfycfbtj t  
 where t.rq between to_date(2013 - 01 - 18   , 'YYYY-MM-DD') and  
       to_date(2013 - 07 - 18    , 'YYYY-MM-DD')  
   and exists (select z.jgdm  
          from t_zzjg z  
         where (z.dwlx = 'SJ' or z.sjjgdm is null)  
           and z.jgdm = t.jgdm)  
 group by t.jgdm  
 order by t.jgdm  

select to_date('2012-05-06 12:05:03','yyyy-mm-dd hh24:mi:ss') from dual
select to_date('2012-05-06','yyyy-mm-dd hh24:mi:ss') from dual
select to_date('2012-05-06','yyyy-mm-dd') from dual