2

首先，这是表格：

CREATE TABLE `outlet_tags` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `importer_id` int(11) NOT NULL,
  `outlet_id` int(11) NOT NULL,
  `code` varchar(20) NOT NULL,
  `postcode` varchar(15) DEFAULT NULL,
  `tag_set` varchar(45) DEFAULT NULL,
  `tag_type` varchar(45) DEFAULT NULL,
  `tag_details` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `fk_report_outlet_tags_1` (`importer_id`),
  KEY `fk_report_outlet_tags_2` (`outlet_id`),
  KEY `outlet_tag_set` (`tag_set`),
  KEY `outlet_tag_type` (`tag_type`),
  KEY `outlet_tag_details` (`tag_details`),
  CONSTRAINT `fk_report_outlet_tags_1` FOREIGN KEY (`importer_id`) REFERENCES `importers` (`id`),
  CONSTRAINT `fk_report_outlet_tags_2` FOREIGN KEY (`outlet_id`) REFERENCES `outlets` (`id`)
) ENGINE=PBXT DEFAULT CHARSET=utf8;

任何人都可以解释为什么字段值会根据以下查询中使用的条件而变化吗？如果引擎是 Maria，则不会发生这种情况。

select * from outlet_tags where code=1503 and outlet_id=407 limit 3;
+------+-------------+-----------+------+----------+---------+-----------------+----------------+
| id   | importer_id | outlet_id | code | postcode | tag_set | tag_type        | tag_details    |
+------+-------------+-----------+------+----------+---------+-----------------+----------------+
|  222 |           1 |       407 | 1503 | XXX XXX  | outlet  | Make up         | Make up        |
|  675 |           1 |       407 | 1503 | XXX XXX  | outlet  | Approved Status | Approved       |
| 1619 |           1 |       407 | 1503 | XXX XXX  | outlet  | Retail Area     | No Retail Area |
+------+-------------+-----------+------+----------+---------+-----------------+----------------+
3 rows in set (0.00 sec)

select * from outlet_tags where code=1503 and importer_id=1 limit 3;
+------+-------------+-----------+------+----------+---------+-----------------+----------------+
| id   | importer_id | outlet_id | code | postcode | tag_set | tag_type        | tag_details    |
+------+-------------+-----------+------+----------+---------+-----------------+----------------+
|  222 |           1 |       407 | 1503 | XXX XXX  | outlet  | Make up         | Make up        |
|  675 |           1 |       407 | 1503 | XXX XXX  | outlet  | Approved Status | Approved       |
| 1619 |           1 |       407 | 1503 | XXX XXX  | outlet  | Retail Area     | No Retail Area |
+------+-------------+-----------+------+----------+---------+-----------------+----------------+
3 rows in set (0.00 sec)

select * from outlet_tags where importer_id=1 and outlet_id=407 limit 3;
+------+-------------+-----------+------+----------+---------+----------+-------------+
| id   | importer_id | outlet_id | code | postcode | tag_set | tag_type | tag_details |
+------+-------------+-----------+------+----------+---------+----------+-------------+
|  222 |           1 |       407 | 1503 | NULL     | NULL    | NULL     | NULL        |
|  675 |           1 |       407 | 1503 | NULL     | NULL    | NULL     | NULL        |
| 1619 |           1 |       407 | 1503 | NULL     | NULL    | NULL     | NULL        |
+------+-------------+-----------+------+----------+---------+----------+-------------+
3 rows in set (0.00 sec)

更新：从 MariaDB 5.5开始，PBXT 作为存储引擎被删除

4

1 回答 1

1

尝试对查询使用 ORDER BY。

根据检索行的方式，不同的引擎可能会以不同的顺序返回行。

于 2011-09-26T17:54:00.143 回答