android sqlite union，如何从表中检索结果？

我有一个SQLite查询：

Cursor orgiCursor = orgiDb.rawQuery("select task,taskDate from meeting where exists 
(select `meeting.taskId from Task, meeting where meeting.taskId = Task.taskId and task.name='"+profName+"')
UNION  SELECT subject,date from taskDeadline where exists (select taskDeadline.taskId from taskDeadline,Task where taskDeadline.taskId=Task.taskId and Task.name='"+profName+"') union select 
specificOccassion,setDate from AnnualTask where exists (select taskId from Task,AnnualTask where Task.taskId = AnnualTask.taskId and Task.name = '"+profName+"' and AnnualTask.setDate<>'--')", null);

它返回此错误：请帮帮我

02-12 19:28:00.809: INFO/Database(14515): sqlite returned: error code = 1, msg = ambiguous column name: taskId
02-12 19:28:00.849: ERROR/AndroidRuntime(14515): Caused by: android.database.sqlite.SQLiteException: ambiguous column name: taskId: , while compiling: select task,taskDate from meeting where exists (select meeting.taskId from Task, meeting where meeting.taskId = Task.taskId and task.name='Maria Ozawa')UNION  SELECT subject,date from taskDeadline where exists (select taskDeadline.taskId from taskDeadline,Task where taskDeadline.taskId=Task.taskId and Task.name='Maria Ozawa') union select specificOccassion,setDate from AnnualTask where exists (select taskId from Task,AnnualTask where Task.taskId = AnnualTask.taskId and Task.name = 'Maria Ozawa' and AnnualTask.setDate<>'--')

02-12 19:28:01.059: ERROR/Database(14515): close() was never explicitly called on database '/data/data/orgy.organizer.home/databases/orgi' 
02-12 19:28:01.059: ERROR/Database(14515): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here

任何帮助都将不胜感激……： 因此，我的问题是： 1.关闭连接/光标需要代码的哪一部分？

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2.为什么Eclipse会给我这个错误？我试着在SQLite Manager中运行同样的语句，它给了我完美的结果

错误似乎出现在查询中，它没有关闭光标的事实是因为他没有正确地计算查询

尝试使用别名当您使用属性taskId时，会多次使用它，可能会混淆编译器

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希望这有帮助

多谢各位。我今天要试试

02-12 19:28:00.809: INFO/Database(14515): sqlite returned: error code = 1, msg = ambiguous column name: taskId
02-12 19:28:00.849: ERROR/AndroidRuntime(14515): Caused by: android.database.sqlite.SQLiteException: ambiguous column name: taskId: , while compiling: select task,taskDate from meeting where exists (select meeting.taskId from Task, meeting where meeting.taskId = Task.taskId and task.name='Maria Ozawa')UNION  SELECT subject,date from taskDeadline where exists (select taskDeadline.taskId from taskDeadline,Task where taskDeadline.taskId=Task.taskId and Task.name='Maria Ozawa') union select specificOccassion,setDate from AnnualTask where exists (select taskId from Task,AnnualTask where Task.taskId = AnnualTask.taskId and Task.name = 'Maria Ozawa' and AnnualTask.setDate<>'--')

02-12 19:28:01.059: ERROR/Database(14515): close() was never explicitly called on database '/data/data/orgy.organizer.home/databases/orgi' 
02-12 19:28:01.059: ERROR/Database(14515): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here