WebMar 2, 2024 · 2. 5.3. I want to join the Activity table to the Lookup table using EF Core. If I was writing a SQL statement I'd just have something like this: SELECT * FROM Activity JOIN Lookup ON Lookup.code = Activity.code AND Lookup.category = 'Activity'. So in EF Core I created my classes to represent my tables: WebSep 20, 2024 · It works because the primary key value in both Table_A and Table_B are same. But if there is two difference primary key values that trying to refer RefId in table_C then below exception is thrown SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_dbo.Table_C_dbo.Table_A_RefId".The conflict occurred …
Entity Framework : map multiple classes to one table
WebDec 24, 2014 · In other words, I want to allow multiple tables in my system to have a One->Many relationship to this KeyValuePair table. So for example, if I wanted to store the height of a Person who has the ID b4fc3e9a-2081-4989-b016-08ddd9f73db0, I would store a row in this table as: OwnerId = "b4fc3e9a-2081-4989-b016-08ddd9f73db0" Key = … WebJun 26, 2012 · 1 Answer. Sorted by: 23. You could try this: var balance = (from a in context.Accounts join c in context.Clients on a.UserID equals c.UserID where c.ClientID … how to increase brightness on dbd
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WebApr 24, 2012 · @ShadiNamrouti Outside of data-modelling contrivances, a common practical scenario is when a single table representing a single entity (with thousands of NOT NULL, absolutely-required) columns needs more columns added but it's too wide for the RDBMS (e.g. SQL Server's 8KB row length limit).If we have TABLE People (with … WebAug 11, 2014 · The fields that match each other are tblCustomerBooking.customer_id -> tblRental.customer_ref. I'm trying to use code first - and building a model class - but I can't figure out how to link the two tables, so that when I query the dbContext, it will return a customer, with one or more rentals within the same model. My table definitions are: WebSep 20, 2024 · For instance, the Entry or Entry (object) methods - they receive T or object instance, but the shared entity needs name, and there is no such method. So you won't be able to get to the tracking state as with "normal" entities. Also context methods like Add, Update, Attach, Remove etc. Only Set method has overload with name. how to increase brightness on dell