Django - ORM raw sql 에서 NULL 값 체크 비교하기 - PostgreSQL

NULL 로 저장된 필드값을 비교하는 방법이 머였지? DB 마다 다를 수 있으니 잘 챙겨보시고, PostgreSQL 에서의 정답은 IS NULL IS NOT NULL SELECT id, first_name, last_name, email, phone FROM contacts WHERE phone IS NULL; https://www.postgresqltutorial.com/postgresql-tutorial/postgresql-is-null/ PostgreSQL IS NULL Summary: in this tutorial, you will learn how to use the PostgreSQL IS NULL operator to check if a value is NULL or not. Introduc..

• format_list_bulleted Tech/Django
• · 2022. 5. 2.
• textsms

장고 ORM - 최근 90일 데이터 읽어오기, NULL, Empty 체크

최근 며칠 데이터 가져오기 요거 많이 쓸 듯 아래 사이트에서 가져옴 https://chartio.com/resources/tutorials/how-to-filter-for-empty-or-null-values-in-a-django-queryset/ Now, by using filter(), we can retrieve a QuerySet of just those books that were published within the last 90 days period, like so: >>> from datetime import datetime, timedelta >>> Book.objects.filter(date_published__gte=datetime.now() - timedelta(days=90)).c..

• format_list_bulleted Tech/Django
• · 2022. 3. 11.
• textsms