check the manual that corresponds to your MySQL server version for the right syntax to use near 'union' at line 28

根据提供的引用内容，报错信息是关于MySQL语法错误的。错误信息中提到了一个特定的语法问题，即在第28行附近使用了'union'关键字。这个错误可能是由于以下原因导致的：

1. 语法错误：在SQL查询中，'union'关键字用于合并两个或多个SELECT语句的结果集。如果在使用'union'时出现语法错误，可能是由于使用了不正确的语法或位置不正确。

2. 引号问题：在报错信息中，也可能是由于引号的使用不正确导致的语法错误。在SQL查询中，字符串值应该使用单引号或双引号括起来。

为了解决这个问题，你可以尝试以下方法：

1. 检查语法：仔细检查SQL查询语句，确保使用了正确的语法和关键字位置。确保在使用'union'关键字时，它的位置和语法都是正确的。

2. 检查引号：如果在查询中使用了字符串值，请确保使用了正确的引号。在SQL中，字符串值应该使用单引号或双引号括起来。

3. 查看文档：如果以上方法都没有解决问题，建议查阅MySQL官方文档，了解关于'union'关键字的正确使用方法和语法规则。

相关问题

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'select id, name

The error message suggests that there is a syntax error in your SQL query near the line that starts with "select id, name". To diagnose and fix the issue, we need to see the complete query and the surrounding context.

However, based on the provided information, it seems that you might be trying to use the "WITH RECURSIVE" syntax in MySQL incorrectly. Here's an example of how you can use it correctly:

WITH RECURSIVE cte (id, name) AS (
  SELECT id, name FROM your_table WHERE condition
  UNION ALL
  SELECT t.id, t.name FROM your_table t INNER JOIN cte ON t.parent_id = cte.id
)
SELECT id, name FROM cte;

In this example, "your_table" is the table you want to perform the recursive query on, "condition" is the condition that filters the initial rows, and "id" and "name" are the columns you want to select.

Make sure to replace "your_table" and "condition" with your actual table name and condition. Also, ensure that your MySQL server version supports the "WITH RECURSIVE" syntax.

If you provide more details about your query and the surrounding code, I can assist you further in identifying and resolving the syntax error.

mybatis xml 报错 Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''(SELECT * FROM wsy_dream.ShopActivity WHERE FIND_IN_SET(2, ShopType) > 0 UNION ' at line 4

根据错误信息，可以看出是在执行 SQL 语句时出现了语法错误。可以将该 SQL 语句复制到 MySQL 客户端中执行，查看具体错误信息。

根据错误信息的位置提示，可以分析出问题的可能原因是 SQL 语句中的引号使用不当，建议检查一下 SQL 语句中引号的使用是否正确。此外，也可以将该 SQL 语句拆分为多个小的 SQL 语句，逐个执行，以确定出错的具体语句。