Group By Query with Entity Framework

Does Entity Framework 6 precompile queries with .Net Framework 4.0

Yes, the ...views... are automatically pre-compiled upon start.

Entity Framework query ToString won't produce SQL query

If you do not need the SQL BEFORE it is executed against the DB you can do the following:...dbContext.Database.Log = s => Debug.WriteLine(s); ...This would print the SQL (and some additional data) to the debug output.... See the following link for details: ...http://msdn.microsoft.com/de-DE/data/dn469464...Also check, as martin_costello suggested, ...

Entity Framework, Load multiple entities by primary key in a single query while still using caching

Not implicitly....Where()... will always query the database. To explicit query the cache you need to use ....Local...: ...dbContext.Entity.Local.Where(......This will not hit the database but it will only return entities that have been cached/loaded before....Good to know: to view the queries define a Log function like this: ...dbContext.Database.L...

Entity framework : Return grouped by value and sum of some columns in the same query

Use ...Sum... and ...Count... query = from record in context.tables group record by new { record.Col3, record.Col4, record.Col5, } into g select new QueryResult { Col1 = g.Sum(x => x.Col1), ...

Entity Framework - slow query after adding group by

Grouping is an expensive operation on the database end. Without knowing what your database looks like and what indexes you've setup, it will be difficult to determine. Why not just group on the client side after the data has arrived (assuming its not an overwhelming amount). ...This question explains how. ...Group by in LINQ

Entity Framework Core 2.0: Error when enumerating over query with group

This seems to be a bug in EF Core 2.0 which got addressed in this issue (Contains workaround):...https://github.com/aspnet/EntityFrameworkCore/issues/9551...You can get the testfeed 2.0.3 here (Contains fix):...https://github.com/aspnet/Announcements/issues/274

sql query on entity-framework core with sum(x-y), count(<condition>) and group

Try something like that;... var query = ef.Cdrs .GroupBy(x => new { Day = date_trunc("d", x.StartTime) }) .Select(x => new { Day = x.Key.Day, Sum = x.Sum(s => s.AnswerTime - s.StartTime), Count = x.Count(c => c.AnswerTime != c.ReleaseTime) });

Entity Framework Core filter related entities and get top 2 for each group

You don't actually need to include here at all, as far as I can tell. Whenever you use data from a nav property, EF will go get the data from that table, as best it can filter it....var CategoriesUnderParent = AppContext.ArticleCategories .Where(c => c.ArticleCategoryParent == {parent}); foreach(var category in CategoriesUnderParent) { var Art...

Is there a way to make the faster ordered SQL TOP 1 query as Entity Framework query?

For this query:...select top (1) m.* from movies m where m.Distributor = 'any' order by m.IMDB_Rating desc; ...You want an index on ...movies(Distributor, IMDB_Rating desc).......I cannot speak to why the second version would be faster.

Linq inner query in join with entity framework, query error

You are left join results from a inner join. I am thinking that is missed in your c# code. But that is not the case for exception....you may try like this....var result = from ca in _dbcontext.CustomerAircrafts //// here join the inner join join pta in (from f in _dbcontext.AircraftPrices join pt in _dbcontext.PricingTemplate on ap.Pri...