使用 HSQL 和 WHERE 语句时的问题

如何解决使用 HSQL 和 WHERE 语句时的问题

在 Hsql 中使用 WHERE 语句时遇到问题。当我按如下方式输入代码时，我没有收到任何错误：

"SELECT Year,ProjectName,(cast(sum(Missed) as float)/(select cast(sum(d.Missed) as float) from Draft d)) as MissedPer from Draft group by ProjectName,Year order by ProjectName"

但是，当我在嵌套查询中添加 WHERE 语句时，出现错误：

"SELECT Year,(cast(sum(Missed) as float)/(select cast(sum(d.Missed) as float) from Draft d where Year = '19.12')) as MissedPer from Draft group by ProjectName,Year order by ProjectName"

错误如下：

线程“main”中的异常java.sql.sqlSyntaxErrorException：表达式不在聚合或GROUP BY列中：CAST((SUM(PUBLIC.DRAFT.MISSED)) AS DOUBLE)/(()) in statement [SELECT BranchNo,(cast(sum(Missed) as float)/(select cast(sum(d.Missed) as float) from Draft d where d.BranchNo = '19.12')) as MissedPer from Draft group by ProjectName,BranchNo order by项目名称]

我不知道如何进行这项工作，请帮忙。

解决方法

我检查了 HSQLDB 2.5.1 版，查询返回结果：

create table draft (year varchar(10),projectname varchar (10),missed int);
insert into draft values '19.10','p alpha',10
insert into draft values '19.11',12
insert into draft values '19.12',3


YEAR  PROJECTNAME MISSEDPER          
----- ----------- ------------------ 
19.10 p alpha     3.3333333333333335 
19.11 p alpha     4.0                
19.12 p alpha     1.0