duplicates

I've seen a couple of solutions for this, but I'm wondering what the best and most efficient way is to de-dupe a table. You can use code (SQL, etc.) to illustrate your point, but I'm just looking for basic algorithms. I assumed there would already be a question about this on SO, but I wasn't able to find one, so if it already exists just give me a heads up. (Just to clarify - I'm referring to getting rid of duplicates in a table that has an incremental automatic PK and has some rows that are duplicates in everything but the PK field.) SELECT DISTINCT <insert all columns but the PK here> FROM

This question already has an answer here: Finding multiple entries with binary search 12 answers I've been tasked with creating a method that will print all the indices where value x is found in a sorted array. I understand that if we just scanned through the array from 0 to N (length of array) it would have a running time of O(n) worst case. Since the array that will be passed into the method will be sorted, I'm assuming that I can take advantage of using a Binary Search since this will be O(log n). However, this only works if the array has unique values. Since the Binary Search will finish

I have a large database (potentially in the millions of records) with relatively short strings of text (on the order of street address, names, etc). I am looking for a strategy to remove inexact duplicates, and fuzzy matching seems to be the method of choice. My issue: many articles and SO questions deal with matching a single string against all records in a database. I am looking to deduplicate the entire database at once. The former would be a linear time problem (comparing a value against a million other values, calculating some similarity measure each time). The latter is an exponential

Alright, I've done some searching and seem to be coming close to the answer I'm looking for. But for fear of messing something up with my current project (I'm a first time app developer and I'm quite pleased so far... I'd like to stay that way), I'm looking for a nice and clear step by step on how to copy a project. I know some things in certain places need to be imported/renamed but I'm not sure exactly what/where. So, is there a good step by step on how to do this or am I missing it? If not, can someone explain it to me in detail? EDIT: I want to copy one app project to make another app

How would you go about marking all of the lines in a buffer that are exact duplicates of other lines? By marking them, I mean highlighting them or adding a character or something. I want to retain the order of the lines in the buffer. Before: foo bar foo baz After: foo* bar foo* baz rampion As an ex one-liner: :syn clear Repeat | g/^\(.*\)\n\ze\%(.*\n\)*\1$/exe 'syn match Repeat "^' . escape(getline('.'), '".\^$*[]') . '$"' | nohlsearch This uses the Repeat group to highlight the repeated lines. Breaking it down: syn clear Repeat :: remove any previously found repeats g/^\(.*\)\n\ze\%(.*\n\)*

I have a MySQL database table with two columns that interest me. Individually they can each have duplicates, but they should never have a duplicate of BOTH of them having the same value. stone_id can have duplicates as long as for each upsharge title is different, and in reverse. But say for example stone_id = 412 and upcharge_title = "sapphire" that combination should only occur once. This is ok: stone_id = 412 upcharge_title = "sapphire" stone_id = 412 upcharge_title = "ruby" This is NOT ok: stone_id = 412 upcharge_title = "sapphire" stone_id = 412 upcharge_title = "sapphire" Is there a

I'am attempting to build a register page and the current code runs correctly but I'am getting duplicate inserts on the DB side. I've researched and have tried several different solutions but nothing has worked out yet. I'm hoping its something very simple that I'am missing. How can I prevent my current code from inserting twice? <?php session_start(); $error=''; // Variable To Store Error Message if (isset($_POST['register'])) { //if (empty($_POST['email']) || empty($_POST['hash'])) { //$error = "<br /> <p style='font-family:talo; color:red; margin-top:10px; font-size:16px;'>* Username or