greatest-n-per-group

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SQL select only rows with max value on a column [duplicate]

Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. Answers without enough detail may be edited or deleted.[详细]

2023-04-12 09:48 分类：问答
Easy SQL Plus Query (group by)

I\'m trying to query my database in the following fashion: Find the name, major and age of the youngest student who is either a Math major or is enrolled in a course taught by a professor that belong[详细]

2023-04-12 08:37 分类：问答
Newest loan per user for all users

// Edit: All work fin开发者_开发问答e with: SELECT u.*, l.cod AS loans_cod, l.step AS loans_step FROM users AS u[详细]

2023-04-12 01:58 分类：问答
How do I use max() in sql

I have a table that looks like this: col1col2col3 ------ ----- ----- A1trout A2trout B1bass C1carp C2tuna D1salmon[详细]

2023-04-10 10:00 分类：问答
Selecting Greatest N records in X groups

So I\'ve been running through all the questions under the greatest-n-per-group tag, and either I don\'t understand what I\'m reading, or nothing has fit my needs so far.This link has alsoprovided a lo[详细]

2023-04-10 02:28 分类：问答
SQL return max value from child for each parent row

I have 2 tables - 1 with parent records, 1 with child records.For each parent record, I\'m trying to return a single child record with the MAX(SalesPriceEach).[详细]

2023-04-09 23:51 分类：问答
How to do SQL join effectively?

I have two tables. Order Replication. A single order record can have multiple Replication records. I want to join these two tables, such that i always retrieve a single record out of the join even[详细]

2023-04-08 11:02 分类：问答
MySQL Left Join + Min

Seemingly simple MySQL question, but I\'ve never had to do this before.. I have two tables, items and prices, with a one-to-many relationship.[详细]

2023-04-08 05:01 分类：问答
How do I select TOP 5 PERCENT from each group?

I have a sample table like this: CREATE TABLE #TEMP(Category VARCHAR(100), Name VARCHAR(100)) INSERT INTO #TEMP VALUES(\'A\', \'John\')[详细]

2023-04-07 23:44 分类：问答
SQL - Select 'n' greatest elements in group

The SQL MAX aggregate function will allow you to select the开发者_运维知识库 top element in a group. Is there a way to select the top n elements for each group?[详细]

2023-04-07 11:00 分类：问答