6个字段采用熵值法进行分析 得到总分 的sql案例

假设有一个表格，其中包含了6个字段，分别为 A、B、C、D、E、F，需要使用熵值法对这些字段进行权重分析，并最终计算出各个记录的总分，可以使用如下的 SQL 语句：

-- 计算各个字段的熵值
SELECT
    (SUM(A * LOG(A)) / LOG(6)) AS entropy_A,
    (SUM(B * LOG(B)) / LOG(6)) AS entropy_B,
    (SUM(C * LOG(C)) / LOG(6)) AS entropy_C,
    (SUM(D * LOG(D)) / LOG(6)) AS entropy_D,
    (SUM(E * LOG(E)) / LOG(6)) AS entropy_E,
    (SUM(F * LOG(F)) / LOG(6)) AS entropy_F
FROM table_name;

-- 计算各个字段的权重
SELECT
    (SUM(A * LOG(A)) / LOG(6)) / entropy_total AS weight_A,
    (SUM(B * LOG(B)) / LOG(6)) / entropy_total AS weight_B,
    (SUM(C * LOG(C)) / LOG(6)) / entropy_total AS weight_C,
    (SUM(D * LOG(D)) / LOG(6)) / entropy_total AS weight_D,
    (SUM(E * LOG(E)) / LOG(6)) / entropy_total AS weight_E,
    (SUM(F * LOG(F)) / LOG(6)) / entropy_total AS weight_F
FROM table_name, (SELECT SUM((SUM(A * LOG(A)) / LOG(6)) + (SUM(B * LOG(B)) / LOG(6)) + (SUM(C * LOG(C)) / LOG(6)) + (SUM(D * LOG(D)) / LOG(6)) + (SUM(E * LOG(E)) / LOG(6)) + (SUM(F * LOG(F)) / LOG(6))) AS entropy_total);

-- 计算各个记录的总分
SELECT
    id,
    A,
    B,
    C,
    D,
    E,
    F,
    (A * weight_A) + (B * weight_B) + (C * weight_C) + (D * weight_D) + (E * weight_E) + (F * weight_F) AS total_score
FROM table_name, (SELECT SUM((SUM(A * LOG(A)) / LOG(6)) + (SUM(B * LOG(B)) / LOG(6)) + (SUM(C * LOG(C)) / LOG(6)) + (SUM(D * LOG(D)) / LOG(6)) + (SUM(E * LOG(E)) / LOG(6)) + (SUM(F * LOG(F)) / LOG(6))) AS entropy_total), (SELECT (SUM(A * LOG(A)) / LOG(6)) / entropy_total AS weight_A, (SUM(B * LOG(B)) / LOG(6)) / entropy_total AS weight_B, (SUM(C * LOG(C)) / LOG(6)) / entropy_total AS weight_C, (SUM(D * LOG(D)) / LOG(6)) / entropy_total AS weight_D, (SUM(E * LOG(E)) / LOG(6)) / entropy_total AS weight_E, (SUM(F * LOG(F)) / LOG(6)) / entropy_total AS weight_F FROM table_name, (SELECT SUM((SUM(A * LOG(A)) / LOG(6)) + (SUM(B * LOG(B)) / LOG(6)) + (SUM(C * LOG(C)) / LOG(6)) + (SUM(D * LOG(D)) / LOG(6)) + (SUM(E * LOG(E)) / LOG(6)) + (SUM(F * LOG(F)) / LOG(6))) AS entropy_total)) AS weights;

其中，第一个 SELECT 语句用于计算各个字段的熵值，第二个 SELECT 语句用于计算各个字段的权重，第三个 SELECT 语句用于计算各个记录的总分。需要注意的是，这些 SQL 语句中的 table_name、id、A、B、C、D、E 和 F 都需要替换成实际的表格名称和字段名称。