Random function

Hi,

I am trying to generate some random data using the random() function.

However, I am getting the same result over mulitiple rows. This is a 
sample of the SQL I am using:

select (select string_agg(random()::text,';')
           from pg_catalog.generate_series(1,3,1) )
   from generate_series(1,10,1)

And I am getting something like:

|string_agg |
+--------------------------------------------------------------+
|0.243969671428203583;0.692578794434666634;0.291524752043187618|
|0.243969671428203583;0.692578794434666634;0.291524752043187618|
|0.243969671428203583;0.692578794434666634;0.291524752043187618|
|0.243969671428203583;0.692578794434666634;0.291524752043187618|
|0.243969671428203583;0.692578794434666634;0.291524752043187618|
|0.243969671428203583;0.692578794434666634;0.291524752043187618|
|0.243969671428203583;0.692578794434666634;0.291524752043187618|
|0.243969671428203583;0.692578794434666634;0.291524752043187618|
|0.243969671428203583;0.692578794434666634;0.291524752043187618|
|0.243969671428203583;0.692578794434666634;0.291524752043187618|

If this is the expected output, is there a way to always generate random 
numbers?