Mysql 如何计算出勤率

我正在计算每个学生的总出勤率。我有两张单独的桌子，我把学生的姓名和ID放在学生桌上，把考勤和ID放在考勤表上。在attendace表上，每个学生有30行，1行和0行。我想列出0seach学生的总出勤人数以及列出的姓名。sql应该是什么样的？谢谢你的帮助

$sql="SELECT * FROM students LEFT JOIN attendance ON students.KategoriID = attendance .KategoriID where WHERE attendance =0 "; 
$sonuc = mysql_query ($sql) ; 
while($satir=mysql_fetch_array($sonuc)) { 

查询：

尝试此查询

---

检查

阅读：提供您迄今为止尝试的表结构和查询？$sql=SELECT*FROM STUDIERS LEFT JOIN ATTIONS ON STUDIERS.KategoriID=ATTIONS.KategoriID，其中ATTIONS=0$sonuc=mysql\u query$sql；而$satir=mysql\u fetch\u array$sonuc{

SELECT student.*, count(attendance.attendance) AS absent FROM student 
LEFT JOIN attendance ON student.KategoriID =attendance.KategoriID  
AND attendance.attendance=0 GROUP BY attendance.KategoriID ORDER BY    
student.KategoriID;