Use user-defined type to combine query logic : Select « Object Oriented « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Object Oriented » Select 
32.11.10.Use user-defined type to combine query logic
SQL> create or replace type myScalarType as objectcnt number, average number )
  2  /

Type created.

SQL>
SQL> select username, a.data.cnt, a.data.average
  2    from (
  3      select username, (select myScalarTypecount(*), avg(object_id) ) from all_objects b where b.owner = a.username data from all_users a A
  4  /

USERNAME                         DATA.CNT DATA.AVERAGE
------------------------------ ---------- ------------
SYS                                  6520   5009.74064
SYSTEM                                422   6095.87678
OUTLN                                   7   1172.57143
DIP                                     0
TSMSYS                                  2       8606.5
INV15                                   2      16237.5
DBSNMP                                 46   9592.65217
INV10                                   2      16227.5
CTXSYS                                338   9877.92012
XDB                                   334   10800.7485
ANONYMOUS                               0

USERNAME                         DATA.CNT DATA.AVERAGE
------------------------------ ---------- ------------
MDSYS                                 458   11667.2009
HR                                     34      12104.5
FLOWS_FILES                            11   12717.2727
FLOWS_020100                         1085    12813.424
JAVA2S                                530   16254.6849
INV11                                   2      16229.5
INV12                                   2      16231.5
INV13                                   2      16233.5
INV14                                   2      16235.5
PLSQL                                   0
INV16                                   2      16239.5

USERNAME                         DATA.CNT DATA.AVERAGE
------------------------------ ---------- ------------
INV17                                   2      16241.5
INV18                                   2      16243.5
INV19                                   2      16245.5
INV20                                   2      16247.5
DEFINER                                 4      16250.5

27 rows selected.

SQL>
SQL>
SQL>
32.11.Select
32.11.1.Selecting Rows from the Table with object type column
32.11.2.Select an individual column object from a table
32.11.3.Querying Rows from the object Table
32.11.4.SELECTing Only One Column in the Composite
32.11.5.COLUMN Formatting in SELECT for Object
32.11.6.ORA-00932: inconsistent datatypes: expected REF
32.11.7.Query table column with user defined type
32.11.8.Use table function to convert type to a 'table'
32.11.9.Create type and use it in inner query
32.11.10.Use user-defined type to combine query logic
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