在结果集中放置一个联合查询

Posted 2023-03-27

【中文标题】在结果集中放置一个联合查询

【英文标题】：Placing a Union query in the resultset

【发布时间】：2011-12-12 02:26:17

【问题描述】：

任何人都可以建议是否有任何规则可以在 jdbc 结果集中放置联合查询？ 我在数据库中有一个联合查询，我得到了输出......但是当我尝试在结果集中放置相同的联合查询时，

我收到一个错误：ASA 错误 -131：'unionselect' 附近的语法错误 在线...

谁能建议我哪里出错了...

jsp页面中查询如下.....

String QueryString = 

"select CONVERT(VARCHAR(7),[startdatetime],111) AS [year-month],nm.nameLine1 as CompanyName, sum(datediff(hour, startdatetime, enddatetime)) as total" 
+" from servicerequestworklog as srl"
+" inner join ServiceRequest sr on srl.ServiceRequestId = sr.ServiceRequestId"
+" inner join Name nm on(sr.clientCustomerId = nm.customerId and nm.nameTypeId = 'OFIC')"
+" where (startdatetime >= '08-01-2011 00:00:00.000' and enddatetime <= '10-31-2011 00:00:00.000')"
+" group by CompanyName, [year-month]"
+"union" 
+"select CONVERT(VARCHAR(7),[startdatetime],111) AS [year-month], 'ZZTOTAL' as CompanyName, sum(datediff(hour, startdatetime, enddatetime)) as total"
+" from servicerequestworklog as srl"
+"inner join ServiceRequest sr on srl.ServiceRequestId = sr.ServiceRequestId"
+" where (startdatetime >= '08-01-2011 00:00:00.000' and enddatetime <= '10-31-2011 00:00:00.000')"
+" group by [year-month]"
+"order by CompanyName, [year-month]" ;

【参考方案1】：

您可以使用PreparedStatement（参数化查询）来避免此类错误。我认为您必须在 union 和 select 单词之间添加空格。

【讨论】：

非常感谢！...我的问题解决了...正如您所料，这是由于 Union AND SELECT 之间的空格...