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我有一个包含 4 个连接的查询。所有 4 个连接都基于mWeeklyAimEntries. 我想将查询限制为mWeeklyAimEntries. 当我限制选择时，它会限制整个查询。需要明确的是，我希望 sql 在第四个之后停止mWeeklyAimEntries并且它是连接的。

与我想要的示例类似的问题。

Future<Map<int, MainAimObject>> getAims(List<int> days,
    {List<int>? lessonIds,
    List<int>? excludedLessonIds,
    List<AimType>? aimTypes,
    int? limit}) async {
  var lesson = alias(mLessons, "l");
  var topic = alias(mTopics, "t");
  var questions = alias(mQuestions, "q");
  var studies = alias(mSessionEntries, "s");
  Expression<bool> dayExp = getDayExpression(days);    
  var weeklyAims = (select(mWeeklyAimEntries).join([
    leftOuterJoin(
        lesson, lesson.id.equalsExp(mWeeklyAimEntries.lessonId) & dayExp),
    leftOuterJoin(
        topic, topic.id.equalsExp(mWeeklyAimEntries.topicId) & dayExp),
    if (aimTypes == null || aimTypes.contains(AimType.questionSolving))
      leftOuterJoin(
          questions,
          questions.lessonId.equalsExp(mWeeklyAimEntries.lessonId) &
              getDayTimestampExpression(days, "q")! &
              questions.topicId.equalsExp(mWeeklyAimEntries.topicId)),
    if (aimTypes == null || aimTypes.contains(AimType.workTime))
      leftOuterJoin(
          studies,
          studies.lessonId.equalsExp(mWeeklyAimEntries.lessonId) &
              getDayTimestampExpression(days, "s")! &
              studies.topicId.equalsExp(mWeeklyAimEntries.topicId)),
  ]));    
  if (limit != null) weeklyAims.limit(limit);
  weeklyAims.where(dayExp);
  if (lessonIds != null) weeklyAims.where(getLessonExpression(lessonIds));
  if (excludedLessonIds != null)
    weeklyAims.where(getLessonExpression(excludedLessonIds, not: true));
    //AFTER THAT, I GET THE QUERY
    .
    .
    .
}
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