Get only one line for each type of a column

Hello!
I have a little problem.

I have a table with 10 columns. One of them has repeated values. My goal is to get all the lines with this column only once for each values he holds.

Ex:

Col1 Col2 Col3
A A A A
B B B
C A C
D C D


Column 2 has repeated values. My goal is to get:

A A A A
B B B
D C D

Only once each value in column 2.

Thank you guys! ;) 
SQL>  CREATE TABLE Tbl (col1 VARCHAR2(1),col2 VARCHAR2(1),col3 VARCHAR2(1));

Table created.

SQL> INSERT INTO Tbl VALUES ('A','A','A');

1 row created.

SQL>              INSERT INTO Tbl VALUES ('B','B','B');

1 row created.

SQL>              INSERT INTO Tbl VALUES ('C','A','C');

1 row created.

SQL>              INSERT INTO Tbl VALUES ('D','C','D');

1 row created.

SQL> commit;

Commit complete.

SQL> SELECT * FROM tbl t1
  2  WHERE
  3  rowid=(SELECT min(rowid)
  4         FROM tbl t2
  5         WHERE t1.col2=t2.col2);

C C C
- - -
A A A
B B B
D C D

SQL> SELECT * FROM tbl t1
  2  WHERE
  3  rowid=(SELECT max(rowid)
  4         FROM tbl t2
  5         WHERE t1.col2=t2.col2);

C C C
- - -
B B B
C A C
D C D

Published by: Johan August 3, 2010 01:31

Tags: Database

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 -  -

    output for data

    GROUPA - TEAM1 - 200
GROUPB - TEAM1 - 300
GROUPC - TEAM2 - 400
GROUPD - TEAM2 - 500
GROUPA - TEAM3 - 600
GROUPB - TEAM3 - 700
GROUPC - TEAM4 - 800
GROUPD - TEAM4 - 900
GROUPA - TEAM5 - 1000

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