Getting the desired Output

Question

Hi ALl,
I have a table as Listed below.
SQL> CREATE  TABLE T1 (c1 varchar2(10),c2 varchar2(10),c3 varchar2(10), c4 var
ar2(10),audit1 number);
Table created.
SQL> DESC T1
Name                                      Null?    Type
C1                                                 VARCHAR2(10)
C2                                                 VARCHAR2(10)
C3                                                 VARCHAR2(10)
C4                                                 VARCHAR2(10)
AUDIT1                                             NUMBER
SQL> INSERT INTO T1 VALUES('A','B',NULL,2,1);
1 row created.
SQL> INSERT INTO T1 VALUES('A','B',1,NULL,1);
1 row created.
SQL> COMMIT;
Commit complete.
SQL> SELECT * FROM T1;
C1         C2         C3         C4             AUDIT1
A          B                     2                   1
A          B          1                              1
SQL>I need to output from the above table as single row considering the Dupilcate values as once row ,and also nned to neglect the Null values from it and take the other possible value in it.
C1         C2         C3         C4             AUDIT1
A          B           1          2                   1

Answer 1

Suppose a new row(below) is added, what do you expect as o/p?
INSERT INTO T1 VALUES('A','B',1,3,2);Purvesh's query will give you the <tt>MAX(c4)</tt> but if you use <tt>SUM(c4)</tt> it'll also give you a single-row & NULLS removed but the values summed.
-- "Query 1"
select c1, c2, max(c3) c3, max(c4) c4, max(audit1) audit1
  from t1
group by c1, c2;
A     B     1     3     2
-- "Query 2"
select c1, c2, SUM(c3) c3, SUM(c4) c4, SUM(audit1) audit1
  from t1
group by c1, c2;
A     B     3     7     6Please clarify this.