count

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Using Count and Max in SQL Query

I have two tables that I am trying to query from, Enrollment and Course开发者_开发知识库. In the course Table, there is just one entry for each course, but in the Enrollment table, there is an entry f[详细]

2023-04-05 09:43 分类：问答
SQL combine COUNT and AVG query with SELECT

I need to get the average rating and the total number of ratings for a particular user and then select all single ratings (rating_value, rating_text, creator) as well:[详细]

2023-04-05 07:51 分类：问答
Count number of rows per group and add result to original data frame

Say I have a data.frame object: df <- data.frame(name=c(\'black\',\'black\',\'black\',\'red\',\'red\'),[详细]

2023-04-05 05:43 分类：问答
Counting strings

Edited question based on response below: I have a list of strings in a text file. I want to count the occurrences of these strings in another text file.[详细]

2023-04-05 02:51 分类：问答
How to sum up the word count for each person in a dialogue?

I\'m starting to learn Python and I\'m trying to write a program that would import a text file, count the total number of words, count the number of words in a specific paragraph (said by each partici[详细]

2023-04-04 21:13 分类：问答
Auto-increment field that resets after a change in another field

Can you provide a very simple SQL example of how to create a \"count\" or \"order\" field that would auto-increment, but restart after every change in a different field? In the table below, the \"Orde[详细]

2023-04-04 20:18 分类：问答
How to optimize MySQL queries and decrease server load?

My db tables look like that First table: Second table - lastsrvc (Last service info). id column -uniques auto-incremented id for every issue. \'cid\' column - company\'s id. It\'s the link column[详细]

2023-04-04 19:35 分类：问答
Get the number of friends of a friend

I\'d like to get the number of the friends o开发者_JAVA百科f a friend. Do you know if it\'s possible ?[详细]

2023-04-04 19:35 分类：问答
Score algorithm in multiple join

I have a list of publications stored in publications table. Each publication has a many-to-many relation with categories and also a many-to-many relation with keywords.[详细]

2023-04-04 18:25 分类：问答
Like count reset after page was temporarily taken offline

The FB Like count on one of our pages was reset to zero after we temporarily took the page offline (we recently reinstated the page onto it\'s old URL).[详细]

2023-04-04 17:40 分类：问答