MYSQL - 求和值兩個表

Question

我需要在具有別名的不同字段中求和數量。

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Answer 1

我不知道你的兩個表名是什么，但這應該有效。 加入idMaterial后，您嘗試在idMaterial上idMaterial 。

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

Answer 2

我認為你需要這個

SELECT SUM(hr) FROM
    (
      Select sum(qty) as hr FROM table1 
      UNION ALL
      Select sum(qty) as hr FROM table2 
    )a