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跨库单表有效:
SqlFunc.Subqueryable<FlowBoxInfo>().AsWithAttr() .Where(f => a.IncomingId.Equals(f.IncomingId)) .Sum(f => f.Qty),
跨库多表无效:SqlFunc.Subqueryable<FlowBoxInfo>().AsWithAttr() .LeftJoin<BoxInfo>((f, g) => f.BoxInfoId.Equals(g.Id) && g.StorageInfoId.HasValue) .LeftJoin<StorageInfo>((f, g, h) => h.Id.Equals(g.StorageInfoId)) .Where(f => a.IncomingId.Equals(f.IncomingId)) .Sum(f => f.Qty),