After intense pressure from within his own party, President Biden said he was ending his campaign and backing Vice President Kamala Harris to run in his place. Ms. Harris said she would seek the ...

SQL是一种非常常见且功能强大的工具，可以帮助从任何数据库中提取、转换和加载数据。数据查询的本质在于SQL。随着公司和组织发现自己处理的数据量迅速增加，开发人员越来越需要有效地使用数据库来处理这些数据。因此，掌握SQL语言是必不可少的。

Do you want to find out how to avoid duplicates in the results of a SQL SELECT query? This article will show you how. Simply use the DISTINCT clause and between the SELECT clause and the fields.

SQL SELECT DISTINCT col as col, count(*) from table_name group by col should has the same result with SQL SELECT col, count(*) from table_name group by col. But the former loses data. The final result ...

In MySQL, the SELECT DISTINCT statement is used to return only distinct values means if in a table, a column has duplicate values then SELECT DISTINCT statement will be used to get different values.

This pattern explains how to perform SELECT DISTINCT by using queries in Microsoft Dynamics NAV. It is brought to you by Bogdana Botez from the Dynamics NAV team here at Microsoft Development Center ...

上一篇讲述了LINQ，顺便说了一下Where操作，这篇开始我们继续说LINQ to SQL语句，目的让大家从语句的角度了解LINQ，LINQ包括LINQ to Objects、LINQ to DataSets、LINQ to SQL、LINQ to Entities、LINQ to XML，但是相对来说LINQ to SQL在我们程序中使用最多，毕竟所有的数据都要在数据库 ...

As I mentioned Monday and in my Visual Studio 2008 review, I've been struggling with the finer points of LINQ queries. In a talkback comment to my review, "CSharper" pointed me at one solution to ...