INNER JOIN (SELECt DISTINCT * FROM X) AliasON Alias.ID = Primary.ID
例如：
INNER JOIN (SELECt DISTINCT VMSUnitID, OrderId FROM tblOrderUnits) ouON o.id = ou.OrderId
INNER JOIN (SELECt DISTINCT * FROM X) AliasON Alias.ID = Primary.ID
例如：
INNER JOIN (SELECt DISTINCT VMSUnitID, OrderId FROM tblOrderUnits) ouON o.id = ou.OrderId
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