problem with variable

Hello everyone

When the trigger executes the function which I copy below:

IF (TG_OP = 'UPDATE') THEN
EXECUTE 'CREATE TABLE '||NEW.nome_tabella||' (ordinativo serial PRIMARY KEY
CHECK (nome_tabella = '||NEW.nome_tabella||'::text))
INHERITS (database_t);

first use of the variable '||NEW.nome_tabella||' is correct and the table is
created with the name, for example "azienda_vallone", but I do not know why,
the second use of the variable is incorrect because the CHECK insert on table
is nome_tabella = azienda_vallone.*.
I can not understand why postgresql insert point and asterisk at the end of
the variable.
if anyone can give me some suggestions on how to resolve...

thank you very much
Luca