Question

SELECT `bio_community_events`.`id`,
       `bio_community_events`.`begin_on`,
       `bio_community_events`.`name`
  FROM `bio_community_events`
  JOIN `bio_contacts`
    ON (`bio_contacts`.`contact_id` = `bio_community_events`.`user_id`)
  JOIN `bio_community_groups`
    ON (`bio_community_groups`.`id` = `bio_community_events`.`group_id`)
 WHERE `bio_contacts`.`user_id` = '33'
 WHERE `bio_community_events`.`group_id` = '1'
 LIMIT 10

UNION ALL

SELECT `bio_community_events`.`id`,
       `bio_community_events`.`begin_on`,
       `bio_community_events`.`name`
  FROM `bio_community_events`
  JOIN `bio_contacts`
    ON (`bio_contacts`.`user_id` = `bio_community_events`.`user_id`)
  JOIN `bio_community_groups`
    ON (`bio_community_groups`.`id` = `bio_community_events`.`group_id`)
 WHERE `bio_contacts`.`contact_id` = '33'
 WHERE `bio_community_events`.`group_id` = '1'
 LIMIT 10

它说：

[Err] 1064 - 你的错误 SQL语法;检查手册对应于您的MySQL服务器用于正确语法的版本靠近'WHERE bio_community_events。group_id = '1'

我找不到语法错误！

修改

我将所有内容包装在括号中并添加“AND WHERE”。不工作......仍然是同样的错误。

新查询：

SELECT `bio_community_events`.`id`,
`bio_community_events`.`begin_on`,
`bio_community_events`.`name`
FROM `bio_community_events`
JOIN `bio_contacts`
ON (`bio_contacts`.`contact_id` = `bio_community_events`.`user_id`)
JOIN `bio_community_groups`
ON (`bio_community_groups`.`id` = `bio_community_events`.`group_id`)
WHERE (`bio_contacts`.`user_id` = '33')
AND WHERE (`bio_community_events`.`group_id` = '1')
LIMIT 10

UNION ALL

SELECT `bio_community_events`.`id`,
`bio_community_events`.`begin_on`,
`bio_community_events`.`name`
FROM `bio_community_events`
JOIN `bio_contacts`
ON (`bio_contacts`.`user_id` = `bio_community_events`.`user_id`)
JOIN `bio_community_groups`
ON (`bio_community_groups`.`id` = `bio_community_events`.`group_id`)
WHERE (`bio_contacts`.`contact_id` = '33')
AND WHERE (`bio_community_events`.`group_id` = '1')
LIMIT 10

编辑＃2：

我看了你的例子。愚蠢的我！感谢。

Answer 1

您有2个WHERE条款，您需要将第二个WHERE替换为AND或OR。

编辑：就像ypercube指出的那样，UNION - 子句的两个子查询都有错误。

例如：

SELECT `bio_community_events`.`id`,
   `bio_community_events`.`begin_on`,
   `bio_community_events`.`name`
FROM `bio_community_events`
JOIN `bio_contacts`
    ON (`bio_contacts`.`user_id` = `bio_community_events`.`user_id`)
JOIN `bio_community_groups`
    ON (`bio_community_groups`.`id` = `bio_community_events`.`group_id`)
WHERE `bio_contacts`.`contact_id` = '33'
AND `bio_community_events`.`group_id` = '1'
LIMIT 10

编辑2：

WHERE子句采用布尔表达式。每个查询只能有一个WHERE子句。

SELECT syntax

Expression syntax

如果要连接2个表达式，则必须使用OR或AND等。您不需要编写另一个WHERE子句。这一切都进入WHERE。

SQL中的语法错误??哪里？

1 个答案: