greatest-n-per-group

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MySQL Query for getting last row on the basis of category

I have the following table structure: Category ------------------- id slug values category sort Incidents -------------------[详细]

2023-04-06 16:24 分类：问答
Only n records for every x field

Given this data set: IDNameCityBirthyear 1Egon SpenglerNew York1957 2Mac TaylorNew York1955 3Sarah ConnorNew York1959[详细]

2023-04-06 15:44 分类：问答
retrieve the most recent record for each customer

I have this data: IDNAMEDATE 3JOHN2011-08-08 2YOKO2010-07-07 1JOHN2009-06-06 Code (for SQL Server 2005): DECLARE @TESTABLE TABLE (id int, name char(4), date smalldatetime)[详细]

2023-04-06 10:12 分类：问答
How to use Group By and self-join to return min, max, open, and close daily price restult set?

SOLVED All hail StackOverlow! While I was gone, people left 2 solutions (thanks guys--what is the protocol for handing out karma for two working solutions?)[详细]

2023-04-05 19:53 分类：问答
Select Most Recent Items with dup values

Given the following information, how can I select the most recent line items (based on time_entered) on unique params and cron_action_id pairs that haven\'t been executed?[详细]

2023-04-05 18:10 分类：问答
MySQL advenced GROUP BY statement

I have table of messages in mysql. Columns are named as sender, reciever, text, id, date. Query like this:[详细]

2023-04-05 07:14 分类：问答
SQL. Column MAX

Ok, So i have 3 T开发者_StackOverflowables: Movies (Movienum, Title, Yearreleased) Actsin (Movienum, StarID)[详细]

2023-04-04 21:48 分类：问答
TSQL - Select the rows with the higher count and when count is the same, the row with the higher id value

HELP!!! I\'m stumped and have tried several options to no avail... I need to return one row for each Pub_id, and the row that is returned should be the one with the higher Count and when there is more[详细]

2023-04-04 19:35 分类：问答
Select top distinct products based on a distinct column

I\'d like to write a sql server 2008 query that selects the top distinct products by a brandId ordered by the latest date published as in the following table:[详细]

2023-04-04 15:24 分类：问答
How to avoid a Select N+1 like problem in this scenario?

Sc开发者_C百科enario: I need to display the average of the last 20 reported values. I need to do this for all users. Am using Sql Server 2005 Express. Thats the lowest version of the db server I need[详细]

2023-04-04 12:41 分类：问答