distinct

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Count distinct group by SQL code?

say I had just 2 columns of data.... Postcode Sold date LE14 6QR 01/01/2011 How could I say...display for each postcode the d开发者_StackOverflow社区ate for each time a house in that area has been[详细]

2023-03-12 08:33 分类：问答
What's better for creating distinct data structures: HashSet or Linq's Distinct()?

I\'m wondering whether I can get a consensus on which method is the better approach to creating a distinct set of elements: a C# HashSet or using IEnumerable\'s .Distinct(), which is a Linq function?[详细]

2023-03-12 07:53 分类：问答
PL/SQL SELECT with multiple COUNT(DISTINCT xxx) - unexpected results

I\'m trying to put together a query for an Oracle 11g application and I\'ve run into a problem. I\'ll simplify the real scenario to make it easier to understand (and also to protect the client\'s dat[详细]

2023-03-11 22:29 分类：问答
Filtering cfquery results

I am editing already existing code, which is why this question is formed as it is. I am attempting to use a query that already exists and without adding more form variables through the url.[详细]

2023-03-11 09:42 分类：问答
MySQL Select Distinct Question

I want to return all columns from a table, but only for the \'unique\' or \'distinct\' users. I want to grab all the distinct users from a table, but return all columns.[详细]

2023-03-11 01:58 分类：问答
SELECT DISTINCT on datetime

I need to display distinct values of a datetime field called datetimestamp from a SQLServer 2005 table in the MMM YYYY format.I also need them to be sorted in chronological order.[详细]

2023-03-10 23:59 分类：问答
Distinct subsets from a set

I wrote an extension method which returns me 2-dimensional array of YUV values from a bitmap i.e.: public static YUV[,] ToYuvLattice(this System.Drawing.Bitmap bm)[详细]

2023-03-10 05:21 分类：问答
Create New Distinct List(of T) from Existing List(of T) Using LINQ

How can I get a new di开发者_开发问答stinct list from an existing list using LINQ?This is what I have so far and it is not distinct but does give me a new list.[详细]

2023-03-09 16:10 分类：问答
How to optimize a slow "select distinct" query across three tables, 40k rows, that only returns 22 results

So I have this query written by someone else that I\'m trying to refactor, which pulls some features/materials for an item(shoes, generally).[详细]

2023-03-08 17:12 分类：问答
MySQL: Select DISTINCT / UNIQUE, but return all columns?

SELECT DISTINCT field1, field2, field3, ...... FROM table; I am trying to accomplish the following SQL statement, but I want it to return all columns.[详细]

2023-03-08 13:27 分类：问答