to display only once.
I have a table which stores alarms. my query is that i have to display all the alarms which are in the table but alarms that are repeated should be displayed only once. for example

table1
-------
alarms
------
A
A
A  
A
B
B
B
C
D
E
------
in the above table say A,B,C,D,E are alarms.the alarms which are repeated should be displayed only once for example alarm A is repeated four times but it has to be displayed only once.the desired output is
A
B
C
D
E

please help me in solving this problem..
Thanks in advance.
to display only once.
===

I have a table which stores alarms. my query is that i have to display all the alarms which are in the table but alarms that are repeated should be displayed only once. for example

table1
-------
alarms
------
A
A
A  
A
B
B
B
C
D
E
------
in the above table say A,B,C,D,E are alarms.the alarms which are repeated should be displayed only once for example alarm A is repeated four times but it has to be displayed only once.the desired output is
A
B
C
D
E

please help me in solving this problem..
Thanks in advance.