distinct

I need to gather Distinct Id's from a particular table using LINQ. The catch is I also need a WHERE statement that should filter the results based only from the requirements I've set. Relatively new to having to use LINQ so much, but I'm using the following code more or less: private void WriteStuff(SqlHelper db, EmployeeHelper emp) { String checkFieldChange; AnIList tableClass = new AnIList(db, (int)emp.PersonId); var linq = tableClass.Items .Where( x => x.UserId == emp.UserId && x.Date > DateBeforeChanges && x.Date < DateAfterEffective && ( (x.Field == Inserted) || (x.Field == Deleted))) ) )

1、distinct select count(distinct CName) from teble select count(CName) from (select distinct CName from Course) as temp SELECT DISTINCT text_zhcn FROM dms_menuconfig -- 去重查询表中数据 select DISTINCT(user_id) from user_info where children_merchant_id='kuaiditong'; 2、group by select count(1) from Course group by CName 文档：mysql去重查询表中数据.note 链接： http://note.youdao.com/noteshare?id=581440d92396bab4de6568d1a69baa58&sub=9B8DAB091CC5490BA5F8FA29557CCD67 来源： https://www.cnblogs.com/LinHuChongChongChong/p/11884830.html

Say I have following results ---------------------- | col1 | col2 | ---------------------- | a | b | | b | a | | c | d | | e | f | ---------------------- I would like to get distinct tuple regardless of column order. In other words, (a, b) and (b, a) are considered "same" because changing the order make one same as the other (a, b) == (a, b). So, after executing query should be: ---------------------- | col1 | col2 | ---------------------- | a | b | // or (b, a) | c | d | | e | f | ---------------------- Can any query expert help me on this? I've been stuck for few hours and wasn't able to

I need to construct a query in Django, and I'm wondering if this is somehow possible (it may be really obvious but I'm missing it...). I have a normal query Model.objects.filter(x=True)[:5] which can return results like this: FirstName LastName Country Bob Jones UK Bill Thompson UK David Smith USA I need to only grab rows which are distinct based on the Country field, something like Model.objects.filter(x=True).distinct('Country')[:5] would be ideal but that's not possible with Django. The rows I want the query to grab ultimately are: FirstName LastName Country Bob Jones UK David Smith USA I

和SQL一样，HiveQL中同样支持DISTINCT操作，如下示例： (1) SELECT count(DISTINCT uid) FROM log (2) SELECT ip, count(DISTINCT uid) FROM log GROUP BY ip (3) SELECT ip, count(DISTINCT uid, uname) FROMlog GROUP BY ip (4) SELECT ip, count(DISTINCTuid), count(DISTINCT uname) FROMlog GROUP BY ip 当我们使用Hive QL中的去重关键字DISTINCT时，需要注意的一点是： 在多个列上进行的去重操作与hive环境变量hive.groupby.skewindata存在关系。 当hive.groupby.skewindata=true时，hive不支持多列上的去重操作 ，并报错： Error in semantic analysis: DISTINCT on different columns notsupported with skew in data. 注意：上面示例中的(3)不属于多列上的DISTINCT操作。 Group By 语句 • Map 端部分聚合： • 并不是所有的聚合操作都需要在 Reduce 端完成，很多聚合操作都可以先在

I am new in XML, so I hope your help. I have the following XML: <?xml version="1.0" encoding="UTF-8"?> <Students> -<Student Id="001"> <Name>Peter</Name> <LastName>Kohen</LastName> -<Courses> -<Course Id="01"> <Name>C#</Name> </Course> -<Course Id="02"> <Name>Java</Name> </Course> </Courses> </Student> -<Student Id="002"> <Name>Nick</Name> <LastName>Nikes</LastName> -<Courses> -<Course Id="02"> <Name>Java</Name> </Course> -<Course Id="03"> <Name>Oracle</Name> </Course> </Courses> </Student> -<Student Id="003"> <Name>Rafi</Name> <LastName>rafifa</LastName> -<Courses> -<Course Id="02"> <Name>Java

/*Oracle数据库查询日期在两者之间*/ SELECT DISTINCT OCCUR_DATE FROM LM_FAULT WHERE ( ( OCCUR_DATE >= to_date( '2017-05-01', 'yyyy-MM-DD' ) ) AND ( OCCUR_DATE <= to_date( '2017-05-15', 'yyyy-MM-DD' ) ) ); 效果如下： 不忘初心，如果您认为这篇文章有价值，认同作者的付出，可以微信二维码打赏任意金额给作者（微信号：382477247）哦，谢谢。 来源： https://www.cnblogs.com/tianpan2019/p/11862662.html