greatest-n-per-group

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Limiting based on value selected from another table

I have the following tables structure: Category: id, name, limit 开发者_JAVA百科posts: id, category, title, body, date, author[详细]

2023-02-06 02:32 分类：问答
Oracle subquery top 1 result

I want to get the top 1 row for each unique value of b with the minimum value of c for that particular value of b. Even though there can be more than 1 row with the same min value (just chose the firs[详细]

2023-02-05 07:19 分类：问答
mySQL Returning the top 5 of each category

I want to be able to return 5 menuitem per menu. I\'ve tried this several script but had no luck. here are the tables[详细]

2023-02-05 04:09 分类：问答
select value from joined table based on lowest value in a different column

(SQL query on Oracle DB) I\'m trying to display an equipment id number on a job record based on the highest priority (lowest number) of all tasks associated with the job.I also need to display all ta[详细]

2023-02-04 15:51 分类：问答
MySQL Group By to display latest result

I\'m trying to query MySQL to ORDER then GROUP... it\'s a question that comes up a lot here and I found an answer that seemed relevant to me: Getting a MySQL group by query to display the row in that[详细]

2023-02-04 13:37 分类：问答
Get latest exchange rate for all currencies

I have a database with a lot a currencies and each row has a currency, d开发者_运维问答atestamp and the exchange rate. What I would like to have is a query that gets me the latest exchange rate for al[详细]

2023-02-04 06:54 分类：问答
MySQL SELECT n records base on GROUP BY

Lets say I have SQL records: Country | Nu开发者_如何学JAVAmber USA | 300 USA | 450 USA | 500 USA | 100[详细]

2023-02-03 23:52 分类：问答
Complex SQL Query with MySQL?

I have a database with: [business] must have a [location] [location] may have many [business] [location] may have many [postcode][详细]

2023-02-03 18:55 分类：问答
How to extract a row with the maximal value?

I have two tables and want to do the following. From the first table I extract all rows that fulfill a given condition. For all extracted rows I take a value from the first column. For every value I e[详细]

2023-02-01 06:01 分类：问答
Getting lowest values in GROUP BY

WITH test_data AS ( SELECT 1 key, 1 a, 2 b FROM dual UNION ALL--# Lowest a for key=1 SELECT 1 key, 2 a, 1 b FROM dual UNION ALL[详细]

2023-01-31 06:10 分类：问答