Top "Unique" questions

Refers to an element that is distinctly different from any other element in a collection.

MySQL: Select N rows, but with only unique values in one column

Given this data set: ID Name City Birthyear 1 Egon Spengler New York 1957 2 Mac Taylor New York 1955 3 Sarah Connor Los Angeles 1959 4 …

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Subset with unique cases, based on multiple columns

I'd like to subset a dataframe to include only rows that have unique combinations of three columns. My situation is …

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SQL: How to find duplicates based on two fields?

I have rows in an Oracle database table which should be unique for a combination of two fields but the …

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C#: How would you make a unique filename by adding a number?

I would like to create a method which takes either a filename as a string or a FileInfo and adds …

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How do I print unique elements in Perl array?

I'm pushing elements into an array during a while statement. Each element is a teacher's name. There ends up being …

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JavaScript Unique Browser Id

is there anyway to create a unique ID for a browser within javascript? Im not talking about an ID that …

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Postgres unique constraint vs index

As I can understand documentation the following definitions are equivalent: create table foo ( id serial primary key, code integer, label …

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phpMyAdmin Removing an index

I have a column in one of my tables which has been assigned an index. It is preventing me from …

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Best method to generate unique filenames when uploading files PHP

Can any one suggest the best practice to generate unique file names for file uploads to avoid duplicate Entries? Thanks …

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Best way to get machine id on Linux?

What is the best-practiced way to get an unique machine ID in GNU/Linux for i386 architecture? Are there any …

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