11/9/2023 0 Comments Mysql join select statementI want to get the latest post of EACH subcategory, but I rather not run this query for each subcategory. However, it only runs this SELECT query for each main category so it's only select THE LATEST post between all subcategories combined. BUT FOR EACH subcategory, I need to grab the latest post. So there are 5 main categories with 3-8 subcategories. However, this select statement is going INSIDE a foreach loop looping around the general categories which is found my main_cat. FOR EACH category, I want to show the latest post and topic title in each category. JOIN forum_post fp ON fp.topic_id = ft.id well I have to put the subquery in a JOIN clause since it selects more than one column and putting it in the SELECT clause does not allow that as it gives me an error of an operand. Ticket tracker Report bugs with Django or Django documentation in our ticket tracker.Ok. Official Django Forum Join the community on the Django Forum. Django Discord Server Join the Django Discord Community. #django IRC channel Ask a question in the #django IRC channel, or search the IRC logs to see if it’s been asked before. django-users mailing list Search for information in the archives of the django-users mailing list, or post a question. Index, Module Index, or Table of Contents Handy when looking for specific information. Getting help FAQ Try the FAQ - it's got answers to many common questions. How are the backward relationships possible?.Additional methods to handle related objects.Escaping percent signs and underscores in LIKE statements.Filters can reference fields on the model.Retrieving specific objects with filters.Saving ForeignKey and ManyToManyField fields.Kevin donated to the Django Software Foundation to Otherwise,īackwards relations may not work properly. Relationships and adds them when the related models eventually are imported.įor this reason, it’s particularly important that all the models you’re usingīe defined in applications listed in INSTALLED_APPS. Related models haven’t been imported yet, Django keeps tracks of the Is created, Django adds backward-relationships to any related models. Then the models module inside each application. Starts, it imports each application listed in INSTALLED_APPS, and Model classes are related to it until those other model classes are loaded? Repeat Yourself) principle, so Django only requires you to define theīut how is this possible, given that a model class doesn’t know which other The Django developers believe this is a violation of the DRY (Don’t Other object-relational mappers require you to define relationships on both How are the backward relationships possible? ¶ For example, here’s a valid asynchronous query: Using this distinction, you can work out when you need to use asynchronous Have asynchronous versions - the asynchronous name for each is noted in itsĭocumentation, though our standard pattern is to add an a prefix.
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