Nettet[英]LINQ how to translate subquery in FROM clause 2016-09-28 00:46:59 2 550 c# / … Nettet11. apr. 2024 · LINQ是一组用于查询各种数据源的语言集成查询（Language-Integrated Query）功能。 使用LINQ，可以使用类似于SQL的语法来查询数据源，而不必编写复杂的循环和条件语句。 以下是使用Queryable类和LINQ查询数据源的示例： using System.Linq; // 查询整数集合中大于5的元素 var numbers = new int [] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; var …
How would you do a "not in" query with LINQ? - Stack Overflow
Nettet23. nov. 2009 · The translation in LINQ to SQL is the Anyoperator: bool whatever = db.Users. Any (u => u.UserName == "whatever"); or: bool bigSpender = db.Purchases. Any (p => p.Price > 1000); Anyis particularly useful in subqueries: var bigSpenders = from c in Customers where c.Purchases. Any (p => p.Price > 1000) orderby … Nettet我有一個 Wav 列的表，其類型為 VARBINARY max 存儲一個wav文件 ，並且希望能夠檢查是否存在從Linq到SQL的wav。 我的第一個方法是在Linq中執行以下操作： 上面的代碼的問題是它將所有二進制內容檢索到RAM，這是不好的 慢和內存飢餓 。 任何想法如何讓Linq查詢轉換成像S irm hypophysaire lyon
SQL Server Interview Questions and Answers - Dot Net Tutorials
NettetAs you can see, the subquery finds any service calls where the ApartmentID equals the ID in the main query. The SELECT 1 is a convention used to show that you’re not really concerned with retrieving any data from the subquery. You’re only using it to exclude records. Like NOT IN, LINQ doesn’t have a NOT EXISTS method. Nettet1. nov. 2024 · Which leads to your first option in creating subqueries in LINQ. LINQ … NettetI would like to implement this in Linq to SQL: select * from ( select * from Orders) as A Obviously this is a pointless example, but I just can't figure out how to do it! 2 answers. ... Jeffrey Hantin 1 ACCPTED 2009-09-16 01:03:47. Try something like this: var subquery = from row in Orders select row; var query = from row in subquery select row; irm hospitalor saint avold