Question

我有以下查询：

SELECT b.id, b.bouquet, JSON_LENGTH(c.sort) - IFNULL(JSON_LENGTH(JSON_EXTRACT(c.sort, REPLACE(JSON_SEARCH(c.sort, 'all', '%m%'), '"', ''))), 0) AS total FROM bouquets b, channels c
LEFT JOIN streams st ON JSON_SEARCH(c.sort, 'one', st.id) IS NOT NULL 
LEFT JOIN streams s ON JSON_SEARCH(s.bouquet, 'one', b.id) IS NOT NULL 
GROUP BY b.id ASC ORDER BY b.bouquet ASC;

我得到错误：

ERROR 1054 (42S22): Unknown column 'b.id' in 'on clause'

我尝试解决这个问题，但我不明白......导致此错误的原因是什么以及如何解决？

更新问题：使用表格结构，这样可以更容易地跟踪如何修复mysql返回的错误。

mysql> SELECT * FROM bouquets;
+----+-----------+
| id | bouquet   |
+----+-----------+
|  1 | Mega      |
|  2 | Resellers |
| 33 | Exchange  |
| 28 | Ex-Yu     |
|  5 | Albanian  |
+----+-----------+
5 rows in set (0.00 sec)

mysql> SELECT * FROM channels;
+----+--------------------------+---------+----------+
| id | sort                     | bouquet | reseller |
+----+--------------------------+---------+----------+
|  1 | ["m1","1","2","11","m2"] | ["1"]   |        1 |
| 27 | ["m1","1","2","m2"]      | ["28"]  |        1 |
| 39 | []                       | ["33"]  |        1 |
+----+--------------------------+---------+----------+
3 rows in set (0.00 sec)

mysql> SELECT * FROM streams;
+----+-------------------+--------------------------------------------------------------------+------------+------------+-------+-------+------+-----------------------+---------------------------------------------+---------------+---------+--------+
| id | channel           | stream                                                             | server     | bouquet    | notes | adult | epg  | acodec                | vcodec                                      | uptime        | bitrate | status |
+----+-------------------+--------------------------------------------------------------------+------------+------------+-------+-------+------+-----------------------+---------------------------------------------+---------------+---------+--------+
|  1 | CH1 1             | ["http://"] | ["1","15"] | ["1","28"] |       |     0 | 0    | mp3 ( VBR: 125 kb/s ) | h264 ( FPS: 25.0 , 720 x 576 , DAR: 16:9 )  | 1528448246933 |    1221 |      1 |
|  2 | CH1 2             | ["http://"] | ["1"]      | ["1","28"] |       |     0 | 0    | mp3 ( VBR: 125 kb/s ) | h264 ( FPS: 25.0 , 720 x 576 , DAR: 16:9 )  | 1528448259003 |    1194 |      1 |
| 11 | CH1 3             | ["http://"] | ["1","15"] | ["1"]      |       |     0 | 0    | mp3 ( VBR: 125 kb/s ) | h264 ( FPS: 25.0 , 720 x 576 , DAR: 16:9 )  | 1528448252725 |    1288 |      1 |
| 12 | CH1 4             | ["http://"] | ["15"]     | ["28"]     |       |     0 | 0    | mp2 ( VBR: 125 kb/s ) | h264 ( FPS: 50.0 , 720 x 576 , DAR: 20:11 ) | 1528448256089 |    1995 |      1 |
+----+-------------------+--------------------------------------------------------------------+------------+------------+-------+-------+------+-----------------------+---------------------------------------------+---------------+---------+--------+
4 rows in set (0.01 sec)

Answer 1

尝试完整定义列名称，如bouquets.id和channels.sort可能

Answer 2

确保花束（b）中的列ID可用。试一试：b。id或花束。id

Answer 3

我找到了解决方案：

SELECT b.id, b.bouquet, IFNULL(JSON_LENGTH(c.sort) - JSON_LENGTH(JSON_SEARCH(c.sort, 'all', '%m%')), 0) AS total FROM bouquets b
LEFT JOIN channels c ON JSON_SEARCH(c.bouquet, 'one', b.id) IS NOT NULL
GROUP BY b.id, b.bouquet, total ORDER BY b.bouquet ASC;

这让我：

+----+-----------+-------+
| id | bouquet   | total |
+----+-----------+-------+
|  5 | Albanian  |     0 |
| 28 | Ex-Yu     |     2 |
| 33 | Exchange  |     0 |
|  1 | Mega      |     3 |
|  2 | Resellers |     0 |
+----+-----------+-------+

感谢大家帮助我。

ERROR 1054（42S22）：未知栏＆＃39; b.id＆＃39;在＆＃39; on条款＆＃39;

3 个答案: