嵌套查询
求和
select
(select sum(XLWeigh) from WeighDiao
where WsType='线材') as XCXLSum,
(select sum(XLWeigh) from WeighDiao
where WsType='棒材') as BCXLSum
(select sum(XLWeigh) from WeighDiao
where WsType='线材') as XCXLSum,
(select sum(XLWeigh) from WeighDiao
where WsType='棒材') as BCXLSum

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