mysql - 除以汇总值

Question

我有这段代码，它总结了员工的小时数并使用 rollup 来获得总小时数:

SELECT IFNULL(users, 'Total') AS Employee, 
SUM(actual) AS Amount

FROM table1

WHERE name = "ProjectName"

GROUP BY users
WITH ROLLUP

Employee  |  Amount
    A     |   15
    B     |   10
    C     |   10
  Total   |   35

我想为我的第三列(百分比)做的是将总和(实际)除以总值以获得百分比。 但对于该百分比列，我不需要获取总百分比。

总值并不恒定为 35。

Employee  |  Amount | Percent
    A     |   15    |  42.85
    B     |   10    |  28.57
    C     |   10    |  28.57
  Total   |   35    |

我该怎么做？ 这是 sqlfiddle:http://sqlfiddle.com/#!2/4543b/5

Answer 1

这按预期工作:

SET @project_name = 'ProjectName';

SELECT IFNULL(users, 'Total') AS Employee, SUM(actual) AS Amount,
    IF(ISNULL(users), '', TRUNCATE(SUM(actual) / sum_table.amount_sum * 100, 2)
    ) AS Percent
    FROM Table1
    INNER JOIN (
        SELECT SUM(actual) AS amount_sum
            FROM Table1
            WHERE name = @project_name
    ) AS sum_table
    WHERE name = @project_name
    GROUP BY users
    WITH ROLLUP;

演示 @ SQL Fiddle