mysql - 如何在mysql中进行序列号排名
问题描述
我有这样的数据:
id | md_name | total_visit
===+==============+============
1 | Nunu Nugraha | 33
2 | Erwin | 32
3 | Tri Sulistyo | 35
4 | Risdianto | 24
5 | Erma | 22
6 | Dwi Sabana | 19
7 | Ernayanti | 26
8 | Ali | 10
9 | Partini | 13
我用这样的连接代码得到了上述结果:
SELECT datamd.id as id,
datamd.nama_md as md_name,
COUNT(R.id) as total_visit
FROM datamd
LEFT JOIN
(
SELECT id, idmd
FROM rincian_kunjungan WHERE status='1' AND MONTH(tanggal_kunjungan)='$bulan' AND YEAR(tanggal_kunjungan)='$tahun'
) AS R
ON datamd.id = R.idmd WHERE status=1 AND level=8 GROUP BY datamd.id ORDER BY datamd.id
我想变成这样:
rank | id | md_name | total_visit
=====+====+==============+============
1 | 3 | Tri Sulistyo | 35
2 | 1 | Nunu Nurgaha | 33
3 | 2 | Erwin | 32
4 | 7 | Ernayanti | 26
5 | 4 | Risdianto | 24
6 | 5 | Erma | 22
7 | 6 | Dwi Sabana | 19
8 | 9 | Partini | 13
9 | 8 | Ali | 10
这里的朋友可以帮帮我吗,我已经尝试使用下面的代码但是在排名栏中它不合适
SET @number = 0;
SELECT @number:=@number+1 as rank, datamd.id as id,
datamd.nama_md as md_name,
COUNT(R.id) as total_visit
FROM datamd
LEFT JOIN
(
SELECT id, idmd
FROM rincian_kunjungan WHERE status='1' AND MONTH(tanggal_kunjungan)='$bulan' AND YEAR(tanggal_kunjungan)='$tahun'
) AS R
ON datamd.id = R.idmd WHERE status=1 AND level=8 GROUP BY datamd.id ORDER BY rank ASC
解决方案
请尝试使用此查询:
我创建了一个表测试并插入了这样的记录:
select * from test ;
+----+--------------+-------------+
| id | md_name | total_visit |
+----+--------------+-------------+
| 1 | Nunu Nugraha | 33 |
| 2 | Erwin | 32 |
| 3 | Tri Sulistyo | 35 |
| 4 | Risdianto | 24 |
| 5 | Erma | 22 |
| 6 | Dwi Sabana | 19 |
| 7 | Ernayanti | 26 |
| 8 | Ali | 10 |
| 9 | Partini | 13 |
+----+--------------+-------------+
我开发了查询:
SELECT @rownum := @rownum +1 rank, id, md_name, total_visit
FROM `test` , (SELECT @rownum :=0)r
ORDER BY total_visit DESC
LIMIT 0 , 30
got this result :
+------+----+--------------+-------------+
| rank | id | md_name | total_visit |
+------+----+--------------+-------------+
| 1 | 3 | Tri Sulistyo | 35 |
| 2 | 1 | Nunu Nugraha | 33 |
| 3 | 2 | Erwin | 32 |
| 4 | 7 | Ernayanti | 26 |
| 5 | 4 | Risdianto | 24 |
| 6 | 5 | Erma | 22 |
| 7 | 6 | Dwi Sabana | 19 |
| 8 | 9 | Partini | 13 |
| 9 | 8 | Ali | 10 |
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