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ORACLEÔÊÐíÔÚselect×Ó¾äÖаüº¬µ¥ÐÐ×Ó²éѯ, ʹÓñêÁ¿×Ó²éѯ¿ÉÒÔÓÐЧµÄ¸ÄÉÆÐÔÄÜ£¬µ±Ê¹Óõ½ÍⲿÁ¬½Ó£¬»òÕßʹÓõ½Á˾ۺϺ¯Êý£¬¾Í¿ÉÒÔ¿¼ÂDZêÁ¿×Ó²éѯµÄ¿ÉÄÜÐÔ
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select a.username,count(*)  from all_users a,all_objects b
where a.username=b.owner(+)
group by a.username;
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select a.username,(select count(*) from all_objects b where b.owner=a.username) cnt
from all_users a;
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select a.username,count(*),avg(object_id) from all_users a,all_objects b
where a.username=b.owner(+)
group by a.username; 
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µ±Í¬Ê±³öÏÖcount(*)/avg()ʱ£¬²»ÊʺÏÔÚselect×Ó¾äÖе÷ÓÃÁ½´Î×Ó²éѯ£¬ÐÔÄÜÉÏ»áÊܵ½Ó°Ïì, ¿ÉÒÔ¸ÄÓÃÏÂÃæÁ½ÖÖ×ö·¨
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select username,to_number(substr(data,1,10)) cnt,to_number(substr(data,11)) avg from
(
select a.username,(select to_char(count(*),'fm0000000009') || avg(object_id) from all_objects b where b.owner=a.username) data
from all_users a
)
 (2).´´½¨¶ÔÏóÀàÐÍ
create or replace type myType as object
(cnt number,avg number);
select username,a.data.cnt,a.data.avg from
(
select username,(select myType(count(*),avg(object_id)) from all_objects b where b.owner=a.username) data
from all_users a


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