php - 如何计算年龄等于一定人数的人数？

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如何计算年龄等于18岁的人数？

<?php $emp_query=mysql_query("SELECT
  'employeeID',
  `LastName`,
  `birthday`,
  (YEAR(CURRENT_DATE)-YEAR(`birthday`))-(RIGHT(CURRENT_DATE,5)<RIGHT(`birthday`,5)
  ) AS `age`
FROM `employee`
ORDER BY `LastName`");
while($row=mysql_fetch_array($emp_query)){ $id=$row['employeeID']; ?>
                <td><?php echo $row['LastName']; ?></td>
                            <td><?php echo $row['birthday']; ?></td>
                            <td><?php  echo $row['age']?></td>

<?php } ?>

最佳答案

如果您对age计算感到满意，则可以将查询改写为：

SELECT COUNT(*)
FROM (SELECT (YEAR(CURRENT_DATE)-YEAR(`birthday`))-(RIGHT(CURRENT_DATE,5)<RIGHT(`birthday`,5)
             ) AS `age`
      FROM `employee`
     ) e
WHERE age = 18;

关于php - 如何计算年龄等于一定人数的人数？ ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/27743142/