Top "Count" questions

In Firebase, is there a way to get the number of children of a node without loading all the node data?

You can get the child count via firebase_node.once('value', function(snapshot) { alert('Count: ' + snapshot.numChildren()); }); But I …

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Fast way to discover the row count of a table in PostgreSQL

I need to know the number of rows in a table to calculate a percentage. If the total count is …

sql postgresql count row

Row count in a csv file

I am probably making a stupid mistake, but I can't find where it is. I want to count the number …

python csv count row

Find the n most common values in a vector

I have a vector say c(1,1,1,1,1,1,2,3,4,5,7,7,5,7,7,7) How do I count each element, and then return the e.g. 3 most common …

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count(*) vs count(column-name) - which is more correct?

Does it make a difference if you do count(*) vs count(column-name) as in these two examples? I have a …

sql count

Count occurrences of a char in plain text file

Is there any way under linux/terminal to count, how many times the char f occurs in a plain text …

linux count terminal character

Python - Identify a negative number in a list

I need help doing a program which should recieve ten numbers and return me the number of negative integers i …

python list count identify

How to count occurrences of a word in all the files of a directory?

I’m trying to count a particular word occurrence in a whole directory. Is this possible? Say for example there …

linux unix count find grep

How do I add two count(*) results together on two different tables?

I have two tables: Toys and Games. +--------------------+------------------+ | Field | Type | +--------------------+------------------+ | toy_id | int(10) unsigned | | little_kid_id | …

mysql count sum

Counting number of grouped rows in mysql

In a table xyz I have a row called components and a labref row which has labref number as shown …

mysql sql count