How to select all id's except one?

In addition to the way you've already done in your question, where you use not equal to (! =), you can do it in other ways:

Using other than :

Select * From Utilizadores Where id_ut <> 1;  

Using not in :

Select * From Utilizadores Where id_ut not in (1); 
/*Usando o not in, você pode passar uma lista de valores (1,2,10)*/

Remembering that you can use these 3 operators ( <> , != , not in ) not only with numeric values, but with texts as well. For example:

Select * From Utilizadores Where nome_ut not in ('João', 'Pedro', 'Maria'); 

Select * From Utilizadores Where nome_ut <> 'João'; 

Select * From Utilizadores Where nome_ut != 'João'; 

Hi, do this:

Select * From Utilizadores Where id_ut <> 1;