Grails 组查询适用于 Mysql，但适用于 SQLServer答案

【问题标题】：Grails group query works with Mysql but fails with SQLServerGrails 组查询适用于 Mysql，但适用于 SQLServer
【发布时间】：2020-08-21 03:17:21
【问题描述】：

我正在使用 Grails，我的这个查询在我使用 MySql 时运行良好，但在我使用 SQL Server 时却失败了

def list = Ticket.executeQuery("select t.expertice from Ticket t where t.currentStatus = 1 and t.team = 11 group by t.expertice")

The errot I get:
ERROR GrailsExceptionResolver - Column 'expertice.id' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
com.microsoft.sqlserver.jdbc.SQLServerException: Column 'expertice.id' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
        at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:216)
        at com.microsoft.sqlserver.jdbc.SQLServerStatement.getNextResult(SQLServerStatement.java:1515)
        at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.doExecutePreparedStatement(SQLServerPreparedStatement.java:404)
        at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement$PrepStmtExecCmd.doExecute(SQLServerPreparedStatement.java:350)
        at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:5696)
        at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:1715)
        at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeCommand(SQLServerStatement.java:180)
        at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeStatement(SQLServerStatement.java:155)
        at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.executeQuery(SQLServerPreparedStatement.java:285)
        at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93)
        at com.bayer.bbs.emea.web.wbt.TestController$_closure4_closure13.doCall(TestController.groovy:65)
        at com.bayer.bbs.emea.web.wbt.TestController$_closure4.doCall(TestController.groovy:29)
        at com.bayer.bbs.emea.web.wbt.TestController$_closure4.doCall(TestController.groovy)
        at java.lang.Thread.run(Thread.java:662)

【问题讨论】：

正如错误所说，Sql server 不允许 group by 没有聚合函数。你想做什么？
该错误与您发布的查询无关。
请调查您可用的格式选项 - 这个问题不可读。

标签： mysql sql-server grails hql

【解决方案1】：

终于成功了……领域专家是一个 Grais 实体。

select t.expertice.id 
from Ticket t 
where t.currentStatus = 1 
      and t.team = 11 
group by t.expertice.id

我包含了.id，它在 MySql 和 SQLServer 中都可以正常工作。

【讨论】：