Dotaz MySQL, odstraňte všechny mezery

Tohle je docela blízko. Za předpokladu:

+-------+---------+------+-----+---------+-------+

| Field | Type    | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| d     | text    | YES  |     | NULL    |       |
| id    | int(11) | YES  |     | NULL    |       |
+-------+---------+------+-----+---------+-------+

Pak tento dotaz:

select x.id,x2.id,x.d,x2.d from x left join x as x2 on replace(x.d," ","") = replace(x2.d," ","") and x.id != x2.id having !(x2.id is null);

Získáte duplicitní řádky. Selže, pokud máte "Helloworld" (tj. bez mezery) a nechcete, aby to odpovídalo.