r("总人口数") = DataTables("总人口").Compute("Count(_Identify)", filter & " And 出生日期 <= #2011-10-31#" ) - DataTables("迁入").Compute("Count(_Identify)", filter & " And 变动日期 > #2011-10-31#" ) + DataTables("迁出").Compute("Count(_Identify)", filter & " And 迁出日期 > #2011-10-31#" ) + DataTables("死亡").Compute("Count(_Identify)", filter & " And 死亡日期 > #2011-10-31#" )
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