PHP MySQL查询：以百分比匹配匹配两个表

Question

我有两个“技能”表，第一个包含员工的技能，第二个包含公司的“技能”。

表员工技能

CREATE TABLE `employee_skills` (
  `e_id` int(8) NOT NULL,
  `skill` int(8) NOT NULL,
  `points` enum('0','25','50','75','100') COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`u_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

表公司技能

CREATE TABLE `company_skills` (
  `c_id` int(8) NOT NULL,
  `skill` int(8) NOT NULL,
  `points` enum('0','25','50','75','100') COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`u_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

因此，如果一家公司的技能 Windows 得分为 100 分，员工为 25 分，则匹配百分比为 25%。我正在使用以下查询来获取结果：

$result = $connection->prepare("select u_id, skill, points, COUNT(points) from employee_skills");

预期的结果应该与某些技能相匹配，并返回类似于以下的百分比：

技能 |匹配

• 窗户 | 25%
• Linux | ...%
• mac | ...%

Answer 1

试试下面：

SELECT e_id, e.skill, c.skill, (e.points/c.points)*100 from employee_skills as e, company_skills as c
WHERE e.skill = c.skill
GROUP BY e.e_id,e.skill

见下文：

SELECT c.skill, total_emp_points, c.points as total, 
(total_emp_points/c.points)*100 as percnt FROM company_skills AS c,
(SELECT e.skill, SUM(e.points) as total_emp_points 
    FROM employee_skills as e 
    GROUP BY e.skill) as emp
WHERE c.skill = emp.skill;

见SqlFiddle