How to aggregate data in SQL Query

Hi,
I have Table1 field1 and field2. Combination of these fields form the key of this table.
Next I have Table2 with field3 and field4. field1 is the unique key for this table.
My query is:
select T2.field4||','||T1.field2 from T1 inner join T2 on T1.field1 = T2.field3;
In the result I want to aggregate the data by T2.field4
How do I that? Please help
Thanks in advance,
Raja

How to aggregate data in SQL Query By using aggregate functions and group by:
SQL> select object_type, count(*), sum(decode(status,'VALID',0,1)) inv_obs
2 from all_objects
3 group by object_type;
OBJECT_TYPE                     COUNT(*)              INV_OBS
CONSUMER GROUP                         2                    0
INDEX PARTITION                      970                    0
TABLE SUBPARTITION                    14                    0
SEQUENCE                             226                    0
SCHEDULE                               1                    0
TABLE PARTITION                      349                    0
PROCEDURE                             21                    0
OPERATOR                              57                    0
WINDOW                                 2                    0
PACKAGE                              313                    0
PACKAGE BODY                          13                    0
LIBRARY                               12                    0
PROGRAM                                9                    0
INDEX SUBPARTITION                   406                    0
LOB                                    1                    0
JAVA RESOURCE                        771                    0
XML SCHEMA                            24                    0
JOB CLASS                              1                    0
TRIGGER                                1                    0
TABLE                               2880                    0
INDEX                               4102                    0
SYNONYM                            20755                  140
VIEW                                3807                   72
FUNCTION                             226                    0
WINDOW GROUP                           1                    0
JAVA CLASS                         16393                    0
INDEXTYPE                             10                    0
CLUSTER                               10                    0
TYPE                                1246                    0
EVALUATION CONTEXT                     1                    0

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