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SQL code
create or replace procedure proc(tabname in varchar2,
col1 in varchar2,
col2 in varchar2,
col3 in varchar2,
viewname in varchar2 default 'v_tmp')
as
sqlstr varchar2(2000):='create or replace view '||viewname||' as select '||col1||' ';
c1 sys_refcursor;
v1 varchar2(100);
begin
open c1 for 'select distinct to_char('||col2||') from '||tabname;
loop
fetch c1 into v1;
exit when c1%notfound;
sqlstr:=sqlstr||'
,max(decode('||col2||','''||v1||''','||col3||'))"'||v1||'"';
end loop;
close c1;
sqlstr:=sqlstr||' from '||tabname||' group by '||col1;
execute immediate sqlstr;
end proc;
ÕâÀïµÄ¼¸¸ö²ÎÊý£¬tabnameÖ¸µÄÊÇÐèÒª½øÐÐÐÐÁÐת»»µÄ±íÃû£¬col1ÊÇÕâ¸ö±íÖÐÐÐÁÐת»»ÒÔºóÒª¸ù¾ÝÄÄÒ»ÁнøÐзÖ×飬ÄÇÒ»ÁеÄÁÐÃû¡£col2´«ÈëµÄÊÇÒª½«ÐÐת³ÉÁеÄÄÇÒ»ÁеÄÁÐÃû£¬col3±íʾÐèÒª½øÐÐͳ¼ÆµÄÊý¾ÝÁеÄÁÐÃû
viewname´«ÈëÏ£Íû½¨Á¢µÄÊÓͼµÄÃû³Æ£¬¿ÉÒÔ²»ÌĬÈÏΪv_tmp
Õâô˵ºÜÄÑÈÃÈËÃ÷°×..¾Ù¸öÀý×Ó£¬ÒýÓÃÒ»¸öÌû×ÓµÄÊý¾Ý
create table tab (
counter varchar(20),        -- ²Î¼Ó¿¼ÊÔÈËÊý
subject varchar(20),        -- ¿ÆÄ¿
class varchar(20)          -- °à¼¶
)
±íÊý¾Ý£º
counter  subject  class
36        Ó¢Óï      Ò»°à     
44        Ó¢Óï      ¶þ°à
44        Êýѧ      ¶þ°à
33        ÓïÎÄ      Ò»°à
39        ÓïÎÄ      Èý°à
ת»»ºó£º


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