Incorrect syntax near the keyword 'ON'.

通常出现“Incorrect syntax near the keyword…”的错误信息是由于 SQL 语句中出现了语法错误。在你的情况中，错误位于 ON 关键字。常见的 ON 错误包括：

1. JOIN 语句中 ON 子句错误。请检查 JOIN 语句中 ON 子句的语法是否正确，包括表名、列名和运算符等是否正确。
2. WHERE 子句中的 ON 错误。ON 关键字只在 JOIN 中使用，如果在 WHERE 子句中使用会导致语法错误。
3. 子查询中的 ON 错误。如果你在子查询中使用了 ON 关键字，可能需要确保它被正确地包含在 JOIN 语句中。

你可以仔细检查你的 SQL 语句，并参考 SQL 语法手册来查找错误并进行修改。

相关问题

Incorrect syntax near 'FORCE'.

This error message typically occurs in SQL when the keyword "FORCE" is used incorrectly or in an unsupported way.

Here are a few possible causes and solutions for this error:

1. Using "FORCE" as a keyword in a SQL statement:
- Solution: "FORCE" is not a valid SQL keyword, so you should remove it or replace it with a valid keyword.

2. Using "FORCE" as a column name or table name:
- Solution: If you have a column or table named "FORCE", you should rename it to something else. "FORCE" is not a good name for a database object because it is a reserved keyword in some contexts.

3. Using "FORCE" in a statement that is not supported by your database system:
- Solution: Some SQL statements or clauses may not be supported by all database systems, so you should check the documentation for your database to see if "FORCE" is a valid keyword. If it is not, you may need to rephrase your statement or use a different approach.

Overall, the best way to avoid this error is to carefully review your SQL code and make sure that all keywords, identifiers, and statements are valid and supported by your database system.

Incorrect syntax near the keyword 'BY'.

错误消息"Incorrect syntax near the keyword 'BY'"通常表示SQL查询中的语法不正确，可能是在某个地方使用了关键字"BY"但并未按照正确的语法规则。这可能是由于以下几个原因：

1. **JOIN操作**：如果你正在尝试在`FROM`之后的`JOIN`子句中使用`BY`，那应该是`ON`而不是`BY`，用于指定连接条件。例如，应写成`JOIN table_name ON condition`。

   SELECT * 
   FROM table1 
   JOIN table2 ON table1.id = table2.id;

2. **GROUP BY**：如果在`SELECT`语句后面看到了`BY`，可能是在执行聚合操作（如`COUNT`, `SUM`, `AVG`, `MAX`, `MIN`）时，应该使用`GROUP BY`关键字。

   SELECT column1, AVG(column2)
   FROM table_name
   GROUP BY column1;

3. **窗口函数**：某些数据库（如SQL Server）支持窗口函数（比如`ROW_NUMBER()`），这时可能会用到`OVER(PARTITION BY ... ORDER BY ...) BY`结构。

   SELECT row_number() OVER(ORDER BY column DESC) as rank, *
   FROM table_name;

要解决这个问题，检查你的查询，确保`BY`用在了正确的上下文中，并遵循相应的SQL语法。如果你不确定具体在哪里出错，可以试着逐步地分解你的查询，或者查阅相关的SQL文档以确认正确的用法。