PostgreSQl: select multiple rows and make it in one row

Question

I'm using PostgreSQl and this is my table in database:

how can I write a query that gives me this result :

Answer 1

or you can write query like

select id_salarie, 
max(case when date_pointage = '2015-01-01' then round(nb_heures::numeric,2) else null end) as "2015-01-01",
max(case when date_pointage = '2015-01-02' then round(nb_heures::numeric,2) else null end)as "2015-01-02", 
max(case when date_pointage = '2015-01-03' then round(nb_heures::numeric,2) else null end) as "2015-01-03"
from my_table where id_salarie = 1
group by id_salarie;

Query looks huge and terrible but works for cubes