Entity Framework with Include and Select together
2015年7月8日 · how to include the food and food type in the second query? For your second solution, I think you can use: .Include(p => p.ProgramFoods.Select(f => f.Food)) .Include(p => p.ProgramFoods.Select(f => f.FoodType)) where p.Id == Id. select new { Program = p, ProgramFoodTypes = from pf in p.ProgramFoodTypes. where pf.IsActive.
c# - Include () vs Select () performance - Stack Overflow
2018年2月1日 · In general I would say when you need the rows from your Child table use .Include(). Otherwise don't include them. Or in simple words, just read the data you need. If EF didn't already perform a JOIN, the second query wouldn't be able whether there are any child entities. Include includes child entities in the results. It doesn't perform joins.
c# - Linq Sub-Select - Stack Overflow
2014年2月25日 · How do I write a sub-select in LINQ. If I have a list of customers and a list of orders I want all the customers that have no orders. This is my pseudo code attempt: var res = from c in customers . How about: where !orders.Select(o => o.CustomerID).Contains(c.CustomerID) select c; Another option is to use: join o in orders .
Hibernate ORM User Guide - JBoss
The SQL fragment defined by the @Formula annotation can be as complex as you want, and it can even include sub-selects.
Include sub-selects in table view mode (not the editor view)
select col1, col2, col3, (select count (*) from table2 where fk.joinfield = table1.id) as numSubRecords from table1. I never want to update or modify that count, I just want to see it on a per row basis like I used to be able to do with just plain datatables (local or serverside). Help?
Subquery / Raw SQL query in Editor — DataTables forums
2016年7月20日 · https://datatables.net/forums/discussion/22633/include-sub-selects-in-table-view-mode-not-the-editor-view. I'd like to add a field to an editable customer table that shows the number of purchased items per customer (read-only data from a different table).
EF LINQ include multiple and nested entities - Stack Overflow
2013年4月2日 · As a start - the difference between Select and Include is that that with a Select you decide what you want to return (aka projection). The Include is a Eager Loading function, that tells Entity Framework that you want it to include data from other tables. The Include syntax can also be in string. Like this: db.Courses. .Include("Module.Chapter")
MikroORM 4: Filling the Gaps. | DailyJS - Medium
2020年9月8日 · All methods are optional, if you omit the getSubscribedEntities() method, it means you are subscribing to all entities. There is a special kind of events executed during the commit phase (flush...
Hibernate ORM 6.0.0.CR1 User Guide - JBoss
The SQL fragment defined by the @Formula annotation can be as complex as you want, and it can even include sub-selects.
SQL Subquery: An Ultimate Guide with Practical Examples
By definition, a subquery is a query nested inside another query such as SELECT, INSERT, UPDATE, or DELETE statement. In this tutorial, we are focusing on the subquery used with the SELECT statement. In this example, you can rewrite combine the two queries above as follows: employee_id, first_name, last_name. FROM . employees. WHERE .