2条回答 默认 最新
- doulu3865 2016-04-07 15:25关注
I don't what your two table names are but this should work. You're trying to aggregate on
idMaterial
after joining onidMaterial
.SELECT A.idMaterial, C.nombre_material, A.sum_qty_entrada, B.sum_qty_salida, (A.sum_qty_entrada - B.sum_qty_salida) total FROM ( SELECT idMaterial, SUM(qty) sum_qty_entrada FROM mesa_entrada GROUP BY idMaterial ) AS A JOIN ( SELECT idMaterial, SUM(qty) sum_qty_salida FROM mesa_salida GROUP BY idMaterial ) AS B ON A.idMaterial = B.idMaterial JOIN mesa_con_nombre_material AS C ON A.idMaterial = C.idMaterial
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