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我有一个非常复杂的选择语句，它使用内部连接从表中返回计数统计信息（将其视为答案库——下面的复杂选择语句）。

这些答案与名为 Questions_Bank_AnswerChoices 的表相关（存储所有问题）。

我试图首先提取问题（从表 Questions_Bank_AnswerChoices 中），然后将它们与统计数据（下面的复杂语句）匹配。下面的复杂语句提取统计数据，但除非问题已得到回答，否则不会提取问题。

因此，如果没有人回答问题 1，那么问题 1 将不会显示在统计数据中，因为它不包含在“答案”表中（因为没有人回答它）。

我怎样才能做到这一点？我认为我需要外部加入？

复杂的选择语句：

WITH tbl as (
   SELECT 
      Questions_Bank.QuestionID, Questions_Bank.QuestionName,   
      REPLACE(Schools_Answers_Items.AnswerValue, '? ', ', ') as AnswerValue, 
      COUNT(Schools_Answers_Items.SchoolsAnswersItemID) AS CountAnswer,
      Schools_Answers_Items.SchoolID 
   FROM Questions_Bank 
   INNER JOIN Schools_Answers_Items
     ON Questions_Bank.QuestionID = Schools_Answers_Items.QuestionID 
   LEFT OUTER JOIN Schools_Answers  
     ON Schools_Answers_Items.SchoolsAnswerID = Schools_Answers.SchoolsAnswerID 
   WHERE (Questions_Bank.QuestionID = 1108) 
     AND (Schools_Answers.SchoolID = 103) 
   GROUP BY 
      Schools_Answers_Items.SchoolID,         
      Schools_Answers_Items.AnswerValue,
      Questions_Bank.QuestionID, 
      Questions_Bank.QuestionName
) 
SELECT 
   QuestionID, QuestionName, AnswerValue, CountAnswer, 
   SUM(CountAnswer) OVER () AS CountAllAnswers  
FROM tbl
4

1 回答 1

1

尝试改变这个

INNER JOIN Schools_Answers_Items
  ON Questions_Bank.QuestionID = Schools_Answers_Items.QuestionID

至

LEFT OUTER JOIN Schools_Answers_Items
  ON Questions_Bank.QuestionID = Schools_Answers_Items.QuestionID

你可能想删除这个

AND (Schools_Answers.SchoolID = 103)

或者用这个替换它

AND (Schools_Answers.SchoolID = 103 OR Schools_Answers.SchoolID IS NULL)

尝试这个：

   SELECT 
      Questions_Bank.QuestionID, Questions_Bank.QuestionName,   
      REPLACE(Schools_Answers_Items.AnswerValue, '? ', ', ') as AnswerValue,
      Schools_Answers_Items.SchoolID 
   FROM Questions_Bank 
   LEFT OUTER JOIN Schools_Answers_Items
     ON Questions_Bank.QuestionID = Schools_Answers_Items.QuestionID 
   LEFT OUTER JOIN Schools_Answers  
     ON Schools_Answers_Items.SchoolsAnswerID = Schools_Answers.SchoolsAnswerID 
   WHERE Schools_Answers_Items.SchoolID
于 2012-08-15T23:48:15.143 回答