语句描述:Linq使用Group By和Max查找交易流水每种支付渠道的最高金额的一笔交易。说明:先按ZhiFuQuDao进行分类,然后获取每个分类的最高一笔交易金额赋给MaxPrice。最小值、平均值和求和实现和此类似,替换关键之即可3.多列(Multiple Columns)var dateQDList = from T in hisDZD group T by new { T.JiaoYiRQ,...
语句描述:Linq使用Group By和Max查找交易流水每种支付渠道的最高金额的一笔交易。 说明:先按ZhiFuQuDao进行分类,然后获取每个分类的最高一笔交易金额赋给MaxPrice。最小值、平均值和求和实现和此类似,替换关键之即可 3.多列(Multiple Columns) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 vardateQDList=fr...
主要讨论order by 和group by的使用 1.linq order by(多列) var list= from r in Transactions...group T by T.ZhiFuQuDao into g select g; 语句描述:Linq使用Group By 统计交易流水的支付渠道方式(支付宝或微信等等...最小值、平均值和求和实现和此类似,替换关键之即可 3.多列(Multiple ...
public class SumColumns { public static void SumCSVColumns(string fileName) { string[] lines = File.ReadAllLines(fileName); // Specifies the column to compute. int exam = 3; // Spreadsheet format: // Student ID Exam#1 Exam#2 Exam#3 Exam#4 // 111, 97, 92, 81, 60 //...
C# Linq Group By on multiple columns C# LINQ List<KeyValuePair<string, KeyValuePair<int, int>>> Group by to List<KeyValuePair<string, List<KeyValuePair<int, int>>> C# LINQ one condition, return multiple columns and rows C# LINQ order by not working for a SQL table with a primary ke...
If an operator is marked in two columns, two input sequences are involved in the operation, and each sequence is evaluated differently. In these cases, it is always the first sequence in the parameter list that is evaluated in a deferred, streaming manner. Expand table Standard query operato...
说明:按指定表达式对集合排序;延迟,:按指定表达式对集合排序;延迟,默认是升序,加上descending表示降序,对应的扩展方法是OrderBy和OrderByDescending 1.简单形式 这个例子使用 orderby 按雇用日期对雇员进行排序: var q = from e in db.Employees orderby e.HireDate ...
{min}"); }staticvoidMultiColumns(IEnumerable<string> strs){ Console.WriteLine("Multi Column Query:");// Create a query, multiColQuery. Explicit typing is used// to make clear that, when executed, multiColQuery produces// nested sequences. However, you get the same results by/...
这个示例在Group By子句后使用Where子句查找所有至少有10种产品的类别。 说明:在翻译成SQL语句时,在最外层嵌套了Where条件。 10.多列(Multiple Columns) var categories = from p in db.Products group p by new { p.CategoryID, p.SupplierID } into g...
Ordering Data in LINQ Queries by More Than One Column Pranay Rana 4.93/5 (12 votes) Jul 26, 2011CPOL 119657 How to do ordering when you require to order data by using multiple columnsAdvertise Privacy Cookies Terms of Use Copyright © CodeProject, 1999-2025All Rights Reserved....