WebAnd I want each author with its last book: SELECT book.id, author.id, author.name, book.title as last_book FROM author JOIN book book ON book.author_id = author.id GROUP BY author.id ORDER BY book.id ASC. Apparently you can do that in mysql: Join two tables in MySQL, returning just one row from the second table. But postgres gives … WebFeb 19, 2015 · SELECT aid, actors, a_person.name, benefactors, b_person.name FROM eg_assoc LEFT JOIN eg_person a_person on a_person.id = any(eg_assoc.actors) LEFT JOIN eg_person b_person on b_person.id = any(eg_assoc.benefactors); It would be really nice if I could get it to look like this though. Just aggregate the values based on the aid:
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WebApr 11, 2024 · Eager loading with Preload, Joins. Transactions, Nested Transactions, Save Point, RollbackTo to Saved Point. Context, Prepared Statement Mode, DryRun Mode. Batch Insert, FindInBatches, Find/Create with Map, CRUD with SQL Expr and Context Valuer. WebMar 3, 2024 · 1 Answer. Sorted by: 2. You are almost there with the second query, you can combine the Preload and Where functions with it. var sellers []Seller db.Joins ("JOIN shops s on s.id = sellers.shop_id"). Joins ("JOIN shop_types st on st.id = s.shop_type_id"). Preload ("Shop.ShopType"). Websql vs gorm sql和gorm执行联接方式的一个区别是，sql联接是在sql本身中动态创建的。而gorm连接是由域类关联预先确定的。这意味着在hql中不能加入子查询。您可以阅读更多关于这些差异的信息. 一个例子 话虽如此，使用您的示例sql，我对您的域模型做了一个假设： body ache after sneeze