如何从多个表返回结果

Question

我有两个表用于测验应用程序：

[Questions]
_id, question, correctAnswerId

[Answers]
_id, answer, questionId

当我查询问题时，例如

SELECT question FROM Questions WHERE _id = 2

我还希望获得与该问题相关的（正确和错误）答案。如何一次查询问题和答案，以便我不必单独查询答案？

Answer 1

使用JOIN：

SELECT q.question, a.answer
FROM Questions q JOIN Answers a ON q._id = a.questionId
WHERE q._id = 2