I inserted between two tables fields A,B,C,D, believing I had created a Unique Index on A,B,C,D to prevent duplicates. However I somehow simply made a normal index on those. So duplicates got inserted. It is 20 million record table.
If I change my existing index from normal to unique or simply a add a new unique index for A,B,C,D will the duplicates be removed or will adding fail since unique records exist? I'd test it yet it is 30 mil records and I neither wish to mess the table up or duplicate it.
If you use the IGNORE modifier, errors that occur while executing the INSERT statement are ignored. For example, without IGNORE, a row that duplicates an existing UNIQUE index or PRIMARY KEY value in the table causes a duplicate-key error and the statement is aborted. With IGNORE, the row is discarded and no error occurs. Ignored errors generate warnings instead.
This may be a expensive query on 20M rows, but will get you all duplicate keys that will prevent you from adding the primary index.You could split this up into smaller chunks if you do a where in the subquery: where a='some_value'
Duplicate Cleaner has enough features to satisfy even the most demanding power user: findduplicate folders, unique files, search inside zip files, advanced filtering, virtual folders,snapshot states and much more.Full feature list
Duplicate Cleaner is a tool for finding and removing duplicate files from your computeror network drives. It is intended to be used on user content - documents, photos,images, music, video but can be used to scan any type of files.
Free has the basic functionality, and is only for personal/home use - not for use in acommercial environment. Pro has lots more functions including similar image detection,finding duplicate folders and unique files, searching in zip files and advanced filtersand search methods.Full featurelist and comparison.
I believe that the above solution that I tried is not an optimum solution. Therefore, I need help from you guys to suggest the fastest way to remove duplicates from the slice?
I found Burak's and Fazlan's solution helpful. Based on that, I implemented the simple functions that help to remove or filter duplicate data from slices of strings, integers, or any other types with generic approach.
So far @snassr has given the best answer as it is the most optimized way in terms of memory (no extra memory) and runtime (nlogn). But one thing I want to emphasis here is if we want to delete any index/element of an array we should loop from end to start as it reduces complexity. If we loop from start to end then if we delete nth index then we will accidentally miss the nth element (which was n+1th before deleting nth element) as in the next iteration we will get the n+1th element.
The n value is always 1 value lower than the total of non duplicate elements that's because this methods compare the current (consecutive/single) elements with the next (consecutive/single) elements and there is no matches after the lasts so you have to pad it to include the last.
Note that this snippet doesn't empty the duplicate elements into a nil value. However since the n+1 integer start at the duplicated item's indexes, you can loop from said integer and nil the rest of the elements.
I know that this occurs because Google is attempting to track both the default landing "page" (i.e. www.domain.example/) and the page to which to which DirectoryIndex points (i.e. www.domain.example/index.html). They are, in fact, the same page, and so the warning is the result of a false positive.
index.html should not be part of a URL that users ever see. It is a wide spread web server convention that if you want a page to show up for the directory URL, you put that page into a file called index.html. The reason that you create an index.html file is put the content at the directory URL. index.html doesn't say anything meaningful to users. The URL is always simpler and better without it.
Google is recognizing that you have the same content on two URLs. Google knows that index.html files are meant to show content at the directory. Google is preferring to index the simpler, better URL.
You ask "Why does Google not conflate these and count them as a single page?" -- Well, Google is recognizing that those two URLs are the same page and Google is telling you which URL it chose as the one that it is going to index. Google doesn't usually index multiple URLs with the same content. See What is duplicate content and how can I avoid being penalized for it on my site?.
This does not indicate a huge problem. The worst that is going to happen is that some users see the ugly index.html in URLs. It would be better if you linked to the cleaner form and included the cleaner form in your sitemap, but it won't hurt your search engine rankings too much if you don't do it right. Google is telling you that it is taking care of the issue for you and including the cleaner version in its search index.
There are a number of issues with row times that can make timetables irregular. The row times can be missing. They can be out of order. They can be duplicates, creating multiple rows with the same time that might have the same or different data. And even when they are present, sorted, and unique, they can differ by time steps of different sizes.
Timetables can have duplicate rows. Timetable rows are duplicates if they have the same row times and the same data values. In this example, the last two rows of sortedTT are duplicate rows. (There are other rows in sortedTT that have duplicate row times but differing data values.)
Find the rows that have duplicate row times. First, sort the row times and find consecutive times that have no difference between them. Times with no difference between them are the duplicates. Index back into the vector of row times and return a unique set of times that identify the duplicate row times in uniqueRowsTT.
When a timetable has rows with duplicate times, you might want to select particular rows and discard the other rows having duplicate times. For example, you can select either the first or the last of the rows with duplicate row times by using the unique and retime functions.
Another way to deal with data in the rows having duplicate times is to aggregate or combine the data values in some way. For example, you can calculate the means of several measurements of the same quantity taken at the same time.
(Note: The following assumes that you know where your default VST2 directory is. If for some reason it's on this list, do not delete the files in it unless they are duplicates of plug-ins that are installed as VST3's)
Some of my favorite plug-in companies use installers that unfortunately, install versions of their products that I won't use and/or duplicate versions. I only ever wish to install 64-bit plug-ins, and I give precedence to VST3's if they are available.
The following are quasi "standard" locations for VST2 .DLL's so the installers put them in these directories as another "just in case." If one of these is your own VST2 directory, or if you have plug-ins in it that Cakewalk scans (that aren't in your default VST directory), then leave them alone. Otherwise, they're just duplicates, and you can get rid of whatever .DLL's you find there:
iTunes library always generates lots of duplicated tracks because of many reasons. Such as importing multiple files of same song with different file names or syncing with iPhone and iPod. So, we always need to make iTunes cleanup with a handy iTunes duplicates cleaner. Although, iTunes provides a way to show all duplicated tracks by choosing from menu "File->Display Duplicates", but this only can choose and delete track one by one. iCleanup is exactly such iTunes Cleanup tool made for removing iTunes duplicate tracks automatically.
Show number of duplicates, unwanted tracks and lost dead tracks in different colors visually.Gray color indicates number of duplicates for a track. Red color indicates unwanted tracks which need to be deleted.Orange color indicates number of lost dead tracks.
iCleanup offers three ways for duplicates removal: remove, move to trash and delete permanently.
Remove only remove unwanted tracks from iTunes library, but keep the associated files.
Trash remove unwanted tracks and move the associated files to Trash.
Delete delete associated files permanently.
As I am troubleshooting and trialling my way as a newbie (but decade worth of background in ID) whenever I am copying and pasting content even though they're the same styles, Afpub keeps adding NEW variants into the paragraph styles....very frustrating and extremely laborious to "clean up" I had manually reassign the "based upon" on the previous style, then "reset formatting", before then I can delete this duplicate redundant style.
When using Advanced Matching, Duplicate Check requires a Search Index to be created. There are two options on where to store the Search Index for a certain object. The Search Index can be stored in the Index Object (a custom object, created by Duplicate Check for Salesforce) or you can store this index within the selected object. You can define where to store the Search Index per Object individually.
This study examined the underlying causes of duplicate records using a multisite data set of 398,939 patient records with confirmed duplicates and analyzed multiple reasons for data discrepancies between those record matches. The field that had the greatest proportion of mismatches (nondefault values) was the middle name, accounting for 58.30 percent of mismatches. The Social Security number was the second most frequent mismatch, occurring in 53.54 percent of the duplicate pairs. The majority of the mismatches in the name fields were the result of misspellings (53.14 percent in first name and 33.62 percent in last name) or swapped last name/first name, first name/middle name, or last name/middle name pairs.
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