Question

我是新来的。我的SQL查询中有一些问题。我在我的java代码中编写sql查询，它从用户获取三个值（limit，min，max）并显示最小和最大范围之间的记录。如果用户想要查看10条记录并且在5到100之间的交易值。我正在努力弄清楚查询的正确语法。我的问题是

PreparedStatement statement = con.prepareStatement(""
                 + "Select Transaction_ID, Transaction_Value, Transaction_Type, Description  "
                 + "from Banking "
                 + "limit ? "
                 + "where MIN(Transaction_Value) = ? AND "
                 + "MAX(Transaction_Value) = ? ");

        //setting the limit of records, minimum and maximum values specified by the user
        statement.setInt(1, num);
        statement.setInt(2, min);
        statement.setInt(3, max);

        ResultSet result = statement.executeQuery();

执行此查询时，会提示错误消息

Exception in thread "main" 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 'MIN(Transaction_Value) = 5 AND MAX(Transaction_Value) = 100' at line 1..

非常感谢您的帮助。我真的非常挣扎。我之前使用过简单查询，但dot知道如何修复该错误。非常感谢你。

Answer 1

min和max只是查询中的范围值 - 无需应用聚合函数。此外，limit子句应位于where子句之后：

SELECT Transaction_ID, Transaction_Value, Transaction_Type, Description  FROM   Banking
WHERE  Transaction_Value >= ? AND
       Transaction_Value <= ? 
LIMIT  ?

Answer 2

... WHERE Transaction_Value BETWEEN 5 AND 100;

MIN和MAX应始终在GROUP BY子句中用于超过1行

SELECT MAX(daily_typing_pages)
     FROM employee_tbl;

SELECT id, name, MAX(daily_typing_pages)
    FROM employee_tbl GROUP BY name;

限制最小最大范围值的SQL查询语法

2 个答案: