Pegue esse codigo e coloque no Query analyzer!
DELETE GuildMember
From GuildMember join Guild on GuildMember.G_Name = Guild.G_Name
where Guild.G_Score < ('2')
DELETE Guild
where G_Score < ('2')
Esse codigo apagara todas as guils que nao tem score.
From GuildMember join Guild on GuildMember.G_Name = Guild.G_Name
where Guild.G_Score < ('2')
DELETE Guild
where G_Score < ('2')