MySQL 是否因为插入语句中的嵌套 SELECT 使用 COUNT(*) 函数而不是选择实际列而让我感到悲伤?那么,解决方法是什么?
这是故事:
mysql> explain test;
+----------+----------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+----------------------+------+-----+---------+-------+
| language | varchar(50) | YES | | NULL | |
| count | smallint(5) unsigned | YES | | NULL | |
+----------+----------------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
mysql> SELECT languages.name, COUNT(*) AS `total` FROM languages JOIN events ON languages.id = events.language_id GROUP BY name HAVING total > 250 ORDER BY total DESC;
+-----------+-------+
| name | total |
+-----------+-------+
| Spanish | 60079 |
| Foochow | 2838 |
| Mandarin | 2396 |
| Russian | 1675 |
| Arabic | 1410 |
| Cantonese | 1358 |
| Korean | 736 |
| French | 531 |
| Punjabi | 426 |
| Urdu | 408 |
| Hebrew | 276 |
| Pashto | 255 |
+-----------+-------+
12 rows in set (0.00 sec)
mysql> INSERT INTO test (`language`,`count`) VALUES ((SELECT languages.`name`, COUNT(*) AS `total` FROM languages JOIN events ON languages.id = events.language_id GROUP BY name HAVING total > 250 ORDER BY total DESC));
ERROR 1136 (21S01): Column count doesn't match value count at row 1
谢谢。