Top "Lookup" questions

How to get the Country according to a certain IP?

Does anyone know any simple way to retrieve the country from a given IP Address, preferably in ISO_3166-1 format?

ip lookup country

How to map the sheet 1 data with sheet 2 with help of Unique ID?

I have created an excel sheet with the attributes ID, NAME in one sheet. SHEET 1: In another sheet, I have …

excel lookup vlookup excel-match

Java HashSet equivalent in C++

I was curious if there was something akin the Java HashSet in C++? I.e. a data structure with a …

c++ data-structures stl lookup

Getting keys from a Lookup

How do I get the collection of keys from a Lookup<> I created through the .ToLookup() method? I …

c# .net linq linq-to-objects lookup

Java hashmaps without the value?

Let's say I want to put words in a data structure and I want to have constant time lookups to …

java hashmap lookup containskey

Excel VBA Inputbox - Select range (Type 8) but not as a fixed range i.e. A1 not $A$1

I currently have the following line in my VBA code for an Inputbox: Set myValues = Application.InputBox("Please select on …

excel vba lookup inputbox

lookup function doesn't work with unsorted list

Why does this work, and looks up values correctly but once i change the order of values, it produces incorrect …

google-sheets lookup

$project in $lookup mongodb

I have a query, that use $lookup to "join" two models, after this i use $project to select olny the …

mongodb mongoose mongodb-query aggregation-framework lookup

What is the best data structure for storing a set of four (or more) values?

Say I have the following variables and its corresponding values which represents a record. name = 'abc' age = 23 weight = 60 height = 174 Please …

python data-structures lookup logarithm

If Mongo $lookup is a left outer join, then how come it excludes non-matching documents?

The title says it all. How come if a document does not result in any matching outer document according to …

mongodb aggregation-framework lookup