今天需要做一个统计查询，关联很多表，用稍微复杂的SQL语句可以实现，如下：
select nn.GXDWMC　汉字标题１, nn.TYMC　汉字标题２,jbsl 汉字标题３,fcsl汉字标题４ ,GSL汉字标题５,Lsl汉字标题６ from
   Table0103 nn,

(select b.GXDWMC as GXDWMC,b.TYMC as TYMC,count(a.TYMC) jbsl
   from TABLE0901 a,Table0103 b
    where b.TYMC=a.SSZMC       
    group by  b.GXDWMC ,b.TYMC   
    ) aa,

(select b.GXDWMC as GXDWMC,b.TYMC as TYMC,count(c.TYMC) fcsl
     from Table0103 b ,TABLE0912 c
    where  b.TYMC=c.SSZMC
    group by  b.GXDWMC ,b.TYMC
    ) bb,

(select c.GXDWMC as GXDWMC,c.TYMC as TYMC,count(c.TYMC) GSL
     from Table0103 c ,TABLE0904 d
    where  c.TYMC=d.SSZMC
    group by  c.GXDWMC ,c.TYMC
    ) cc,

(select d.GXDWMC as GXDWMC,d.TYMC as TYMC,count(d.TYMC) lSL
     from Table0103 d ,TABLE0906 e
    where  d.TYMC=e.SSZMC
    group by  d.GXDWMC ,d.TYMC
    ) dd

where nn.GXDWMC=aa.GXDWMC and nn.GXDWMC=bb.GXDWMC
          and  nn.TYMC=aa.TYMC and nn.TYMC=bb.TYMC
          and  cc.TYMC=aa.TYMC and nn.TYMC=bb.TYMC
          and  dd.TYMC=aa.TYMC and nn.TYMC=bb.TYMC

这个统计最终涉及的表可能有１０几张，后面改用存储过程来实现也可以，如下：
CREATE OR REPLACE PACKAGE TSP_YQCY_0F_TJ0 IS

-- Author  :dawn
 -- Created :2011-1-11
 -- Purpose :test

TYPE CUR IS REF CURSOR;
 PROCEDURE TSP_YQCY_0F_TJ0
 (
  P_DW IN VARCHAR2,
  C    OUT CUR
 );
END TSP_YQCY_0F_TJ0;
/
CREATE OR REPLACE PACKAGE BODY TSP_YQCY_0F_TJ0 IS

-- Author  :
 -- Created :
 -- Purpose :

PROCEDURE TSP_YQCY_0F_TJ0
 (
  P_DW IN VARCHAR2,
  C    OUT CUR
 ) AS

begin
  OPEN C FOR

select nn.GXDWMC　汉字标题１, nn.TYMC　汉字标题２,jbsl 汉字标题３,fcsl汉字标题４ ,GSL汉字标题５,Lsl汉字标题６ from
   Table0103 nn,

(select b.GXDWMC as GXDWMC,b.TYMC as TYMC,count(a.TYMC) jbsl
   from Table0901 a,Table0103 b
    where b.TYMC=a.SSZMC       
    group by  b.GXDWMC ,b.TYMC   
    ) aa,

(select b.GXDWMC as GXDWMC,b.TYMC as TYMC,count(c.TYMC) fcsl
     from Table0103 b ,Table0912 c
    where  b.TYMC=c.SSZMC
    group by  b.GXDWMC ,b.TYMC
    ) bb,

(select c.GXDWMC as GXDWMC,c.TYMC as TYMC,count(c.TYMC) GSL
     from Table0103 c ,Table0904 d
    where  c.TYMC=d.SSZMC
    group by  c.GXDWMC ,c.TYMC
    ) cc,

(select d.GXDWMC as GXDWMC,d.TYMC as TYMC,count(d.TYMC) lSL
     from Table0103 d ,Table0906 e
    where  d.TYMC=e.SSZMC
    group by  d.GXDWMC ,d.TYMC
    ) dd

where nn.GXDWMC=aa.GXDWMC and nn.GXDWMC=bb.GXDWMC
          and  nn.TYMC=aa.TYMC and nn.TYMC=bb.TYMC
          and  cc.TYMC=aa.TYMC and nn.TYMC=bb.TYMC
          and  dd.TYMC=aa.TYMC and nn.TYMC=bb.TYMC  
   ;

END;
END;
/

对于复杂的统计,也可以通过创建临时表来完成,具体做法是:
１、建立临时表；
２、通过在包体完成统计，即在临时表里的统计记录的填写；
３、返回结果集，即游标。