我试图显示3个时期的平均休假日和病假。 到目前为止,我有这样的SQL查询: SELECT AVG(VACATIONHOURS) AS 'Vacation hours', AVG(SICKLEAVEHOURS) AS 'SICK DAYS'
FROM HUMANRESOURCES.EMPLOYEE E
WHERE E.BIRTHDATE BETWEEN '01-01-1960' AND '12-
我想,我可能需要帮助,我的PHP代码... 我想呼应在MySQL数据库中的信息,它给我的错误:Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /usr/local/ampps/www/php/db.php on line 18 我的代码是: <?php
$servername =