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分享INSERT MySQL中不能使用UNION吗？
我有一个选择查询工作正常.但是当我将它包装到INSERT语句中时,我收到错误.
错误1064 – 您的SQL语法中有错误;查看与您的MySQL服务器版本对应的手册,以便在'(第4行的SELECT DISTINCT NULL AS id,NULL AS core_value_id,NULL AS translation_id’附近使用正确的语法)
我可以通过为每个源表使用1个插入来解决此问题.但有没有办法用一个查询来做到这一点？为什么这不起作用？
这是查询.
INSERT INTO `some_table`
(
(SELECT DISTINCT
NULL AS `id`,
NULL AS `core_value_id`,
NULL AS `translation_id`,
t1.`upc` AS `source_value`,
t1.`upc` AS `value`,
COUNT(*) AS `count`
FROM `source_table_1` t1
GROUP BY `upc`)
UNION ALL
(SELECT DISTINCT
NULL,NULL,NULL,
t1.`upc`,
t1.`upc`,
COUNT(*) AS `count`
FROM `source_table_2` t1
GROUP BY `upc`
)
ORDER BY `count` DESC
)
这是表定义：
CREATE TABLE `some_table` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`core_value_id` int(11) DEFAULT NULL,
`translation_id` int(11) DEFAULT NULL,
`source_value` varchar(255) NOT NULL,
`value` varchar(255) DEFAULT NULL,
`count` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `core_value_id` (`core_value_id`),
KEY `translation_id` (`translation_id`),
KEY `source_value` (`source_value`),
KEY `value` (`value`),
KEY `count` (`count`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
source_tables看起来像这样：
CREATE TABLE `source_table_1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`upc` bigint(20) DEFAULT NULL,
PRIMARY KEY (`id`),
) ENGINE=InnoDB DEFAULT CHARSET=utf8
upc列的数据如下：
123456789012
123456789013
123456789014
123456789015
123456789016
123456789017
...全文
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weixin_38075050 2019-09-12
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我的猜测是你在个别选择之上缺少一个SELECT子句.此外,括号不合适.试试这个：
INSERT INTO `some_table`
SELECT *
FROM
(
SELECT DISTINCT NULL AS `id`, NULL AS `core_value_id`,
NULL AS `translation_id`, t1.`upc` AS `source_value`,
t1.`upc` AS `value`, COUNT(*) AS `count`
FROM `source_table_1` t1
GROUP BY `upc`
UNION ALL
SELECT DISTINCT NULL, NULL, NULL, t1.`upc`, t1.`upc`,
COUNT(*) AS `count`
FROM `source_table_2` t1
GROUP BY `upc`
) AS dt
ORDER BY `count` DESC
