create table c_product
(id int
,name nvarchar(50)
)

insert into c_product
select 1,'table' union all
select 2,'chair' union all
select 3,'tavolo' 

create table c_action
(id int
,name nvarchar(50)
)

insert into c_action
select 1,'invest' union all
select 2,'purchase' union all
select 3,'bid' union all
select 4,'sell'

create table t_person
(id_person int
,id_product int
,id_action int
)

insert into t_person
select 1, 1, 1 union all
select 1, 1, 3 union all
select 1, 2, 4 union all
select 2, 3, 1 union all
select 2, 3, 4