SQL>
SQL>
SQL> select a.username, (select count(*)
2 from all_objects b
3 where b.owner = a.username) cnt
4 from all_users a
5 /
USERNAME CNT
------------------------------ ----------
SYS 6520
SYSTEM 422
OUTLN 7
DIP 0
TSMSYS 2
INV15 2
DBSNMP 46
INV10 2
CTXSYS 338
XDB 334
ANONYMOUS 0
USERNAME CNT
------------------------------ ----------
MDSYS 458
HR 34
FLOWS_FILES 11
FLOWS_020100 1085
RNTSOFT 530
INV11 2
INV12 2
INV13 2
INV14 2
PLSQL 0
INV16 2
USERNAME CNT
------------------------------ ----------
INV17 2
INV18 2
INV19 2
INV20 2
DEFINER 4
27 rows selected.
SQL>