distinct

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SELECT COUNT(DISTINCT [name]) from several tables

I can perform the following SQL Server selection of distinct (or non-repeating names) 开发者_如何学运维from a column in one table like so:[详细]

2023-03-20 11:15 分类：问答
Django query with distinct and order_by

I have two models class Employer(models.Model): name = models.CharField(max_length=300, blank=False) id = models.IntegerField()[详细]

2023-03-19 03:24 分类：问答
Select a subgroup of records by one distinct column

Sorry if this has been answered before, but all the related questions didn\'t quite seem to match my purpose.[详细]

2023-03-18 20:19 分类：问答
Mysql using DISTINCT on 2 fields only

I have a mysql database table as follows id | uid | touid | message | time This database has the messages sent from one person to another person. I need to fetch the latest messages transferred be[详细]

2023-03-18 17:59 分类：问答
PostgreSQL: how do you SELECT DISTINCT relations and order by different fields depending on WHERE clause?

Each account is associated with one person and one type of account. I want to SELECT a distinct subset of accounts. In order t开发者_Go百科o be selected the accounts have meet at least one of two crit[详细]

2023-03-18 04:07 分类：问答
LINQ Select Distinct Count in Lambda form

Given a linq expression of an object collection \'items\' such as this: var total = (from item in items sel开发者_开发技巧ect item.Value).Distinct().Count()[详细]

2023-03-17 18:33 分类：问答
Removing Items from a list of objects when an object property is duplicated

I am reasonably new to linq and c# so apologies if I am being dumb. I have a query which brings back a list of product info, prices of these products and categories these products are in based on some[详细]

2023-03-17 08:14 分类：问答
Distinct in LINQ with anonymous types (in VB.NET)

Supposing the referenced List below contains 2 elements: Dim Countries = From c In List _ Select New With { .Country = c.Country, .CountryID = c.CountryID }开发者_如何学Python[详细]

2023-03-17 01:13 分类：问答
Distinct Linq filtering with additional criteria

I have a list which contains duplicate item values (by ID), but with a different (or possibly equal) priority. Duplicate items with same or lower priority should be removed from the list.[详细]

2023-03-16 21:29 分类：问答
Query optimization with number of tables join and order by with limit clause

I have a query which has multiple tables joined using distincct - left join - order by - limit clause.[详细]

2023-03-16 20:29 分类：问答