Optimisation de requête SQL

Bonjour, je suis actuellement en galère (: J'ai pondu un code en Visual Basic qui donne ceci :

Code:

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        entiter = CStr(CType(Cbbox_choientite.SelectedItem, ListItem).Value)
        Dim resultSQL4 As DataView = SelectBDD("SELECT id AS id_ticket FROM glpi_tickets WHERE entities_id = " & entiter & "")
        If resultSQL4.Count >= 0 Then
            For Each rst As DataRowView In resultSQL4
                id_ticket = rst("id_ticket")
 
                Dim resultSQL3 As DataView = SelectBDD("SELECT id, actiontime AS temptelephone FROM glpi_tickettasks WHERE tickets_id = " & id_ticket & " and taskcategories_id in (1 ,0)")
                If resultSQL.Count >= 0 Then
                    For Each rst4 As DataRowView In resultSQL3
                        addittiontelephone = addittiontelephone + rst4("temptelephone")
                    Next
                End If
                Dim resultSQL5 As DataView = SelectBDD("SELECT id, actiontime AS tempsite FROM glpi_tickettasks WHERE tickets_id = " & id_ticket & " and taskcategories_id = 2")
                If resultSQL.Count >= 0 Then
                    For Each rst2 As DataRowView In resultSQL5
                        addittionsite = addittionsite + rst2("tempsite")
                    Next
                End If
            Next
        End If

Je fais donc 3 requêtes SQL, ce qui est assez lourd. J'aimerais n'en faire qu'une seul...
Mes compétences en SQL ne me le permettent malheureusement pas...
Du coup je viens demandé de l'aider de votre coté, ce que j'ai réussis à pondre donne ça :

Code:

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select id AS id_ticket, tpsTotal.tpsTel
from table
LEFT OUTER JOIN (
	select id , SUM(temptelephone) As tpstel, SUM(tempSite) As tpsSite
	from (
		SELECT id, 
		CASE WHEN taskcategories_id in (0, 1) then actiontime else 0 end AS temptelephone,
		CASE WHEN taskcategories_id in (2) then actiontime else 0 end AS tempSite 
		FROM glpi_tickettasks 
		WHERE tickets_id=5555
		and taskcategories_id in (0, 1, 2) 
	) sqlDetail
	group by id
) tpsTotal ON tpsTotal.id=table.

Mais ça ne fonctionne pas... SVP help (: