8

我有一个调查表，并且想要删除与某个调查相关的所有记录。

我的桌子：

_______________     _______________     ___________  ________________
|_tblSurvey___|     |_tblAnswers___|    |_tblAlt__|  |_tblQuestions_|
| surveyID    |     | answerAltID  |    | altID   |  | questID      |
| surveyName  |     | userID       |    | altText |  | questText    |
|_____________|     |______________|    |_questID_|  |_surveyID_____|

假设我想删除与surveyID 1 相关的所有记录。

我试过：

DELETE 
 * 
FROM tblSurvey, tblQuestions, tblAlt, tblAnswers
WHERE tblSurvey.surveyID = 1 
AND tblsurvey.surveyID = tblQuestions.surveyID
AND tblQuestions.questID = tblAlt.questID
AND tblAlt.altID = tblAnswers.answerAltID
4

2 回答 2

11

两种方式：

  • 使用 设置外键约束ON DELETE CASCADE。
  • 使用多表DELETE语句。

试试这个：

DELETE tblSurvey, tblQuestion, tblAlt, tblAnswers 
FROM tblSurvey
JOIN tblQuestion ON tblsurvey.surveyID = tblQuestion.surveyID
JOIN tblAlt ON tblQuestions.questID = tblAlt.questID
JOIN tblAnswers ON tblAlt.altID = tblAnswers.answerAltID 
WHERE tblSurvey.surveyID = 1
于 2012-05-06T21:44:53.247 回答
3

如果您的表有外键引用，您可以使用ON DELETE CASCADE

于 2012-05-06T21:46:58.780 回答