sql - Complex Join Query rails -

sql - Complex Join Query rails -

  SELECT course_categories.course_category_title, COUNT (*) के रूप में count_enrollments से गिनती के रूप में पाठ्यक्रमों में शामिल हों course_enrollments.course_id = courses.course_id पाठ्यक्रम में classes_categories.id = courses.course_category_id "course_categores.id द्वारा ग्रुप पाठ्यक्रमों द्वारा classescsales.title    मैं रेल में यह कैसे करूँगा: (मैंने बड़ी त्रुटियों के साथ नीचे की कोशिश की) < ("Course_categories.id")। ("Course_categories.id") क्रम में ("कोर्सकैक्शंसटैटल, COUNT (*) गिनती के रूप में")।  "post-text" itemprop = "text"> 
 मैंने इसे सोचा, मुझे इसमें शामिल होने के रूप में निर्दिष्ट करना आवश्यक है एक स्ट्रिंग।








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