Top "Count" questions

MySQL joins and COUNT(*) from another table

I have two tables: groups and group_members. The groups table contains all the information for each group, such as …

mysql count group-by left-join having

JPA COUNT with composite primary key query not working

In my db, I have a table (Defaults), and when I generate an entity from table, I get these two …

sql hibernate jpa count composite-primary-key

Performing a query on a result from another query?

I have a the query: SELECT availables.bookdate AS Date, DATEDIFF(now(),availables.updated_at) as Age FROM availables INNER …

sql select count aggregate sum

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'), type=…

r count aggregate r-faq

Count distinct value pairs in multiple columns in SQL

What query will count the number of rows, but distinct by three parameters? Example: Id Name Address ============================== 1 MyName MyAddress 2 MySecondName …

sql count distinct

A method to count occurrences in a list

Is there a simple way to count the number of occurrences of all elements of a list into that same …

c# .net-3.5 list count match

PowerShell: how to count number of rows in csv file?

How can I count the number of rows in a csv file using powershell? I tried something like Get-Content -length "…

command-line powershell csv count powershell-1.0

GROUP BY and COUNT in PostgreSQL

The query: SELECT COUNT(*) as count_all, posts.id as post_id FROM posts INNER JOIN votes ON votes.post_…

sql postgresql count distinct aggregate-functions

Conditional Count on a field

If I had a table like this: jobId, jobName, Priority Whereby Priority can be an integer between 1 to 5. Since I …

sql count conditional-statements

Trying to get the average of a count resultset

I have the following SQL:(bitemp) SELECT COUNT (*) AS Count FROM Table T WHERE (T.Update_time = (SELECT MAX (B.…

sql count db2 resultset average