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After more than 2 years, I think that this can be usefull... My [B]table[/B] [I][B]categories[/B][/I] have the parents ids of the roots categories with the value [B][COLOR="Green"]NULL[/COLOR][/B] Two solutions: #1. Don't show the parent's name of the roots (NULL !): [CODE] SELECT c.category_id, c.category AS 'Name', c1.category AS 'Parent Name' …
The End.