duplicate-removal

问题 I'd like to remove duplicates as well as their corresponding, original values from a dataframe. Sframe is the name of my dataframe. The fields on which I want to check for duplicates are 'TermName', 'SchoolName', and 'StudentID'. Here's an example of what I'm starting with: TermName SchoolName StudentID 14-15 a 1 14-15 a 1 14-15 a 1 14-15 b 2 14-15 b 2 14-15 b 3 14-15 c 4 14-15 c 5 14-15 d 6 14-15 e 7 14-15 f 8 Here's what I'm looking for: TermName SchoolName StudentID 14-15 a 1 14-15 a 1 14

问题 I have multiple CSV files with same number of columns BUT different column orders in each , I wanted to merge them removing duplicates, all of the other solutions here dont consider column order hence merging output is incorrect, Hence how to do it in either windows commandline(e.g logparser) or bash? Also python script to achieve this would also do. 回答1: The following script works properly if: csv aren't too big (i.e. can be loaded in memory) the first row of the CSV contains the column

问题 Unless I am missing something or missunderstand the mechanism (very likely) Shouldn't the "1" duplicate not exist in this vector ? chunks.erase( std::unique ( chunks.begin(), chunks.end(), []( std::string &s1, std::string &s2 ){ return ( s1.compare(s2) == 0 ? true : false );}), chunks.end() ); Before Executing the above: 1 l:1 1+ l:2 1+1 l:3 1+1= l:4 + l:1 +1 l:2 +1= l:3 1 l:1 1= l:2 = l:1 After executing the above code: 1 l:1 1+ l:2 1+1 l:3 1+1= l:4 + l:1 +1 l:2 +1= l:3 1 l:1 1= l:2 = l:1 I

问题 I'm trying to filter rows from the MySQL table where all the $_POST data is stored from an online form. Sometimes the user's internet connection stalls or the browser screws up, and the new page after form submission is not displayed (though the INSERT worked and the table row was created). They then hit refresh, and submit their form twice, creating a duplicate row (except for the timestamp and autoincrement id columns). I'd like to select unique form submissions. This has to be a really

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Remove Duplicate Rows Leaving Oldest Row Only? I have a posts_table in my DB.. That posts_table have the fields post_title , post_id , (and some others that dont matter). I need to delete one of the rows if the post_title repeats in another row. Example: posts_table ------------------------------------------- post_id | post_title ------------------------------------------- 501 | Some post title here 502 |

问题 I'm starting with this example table (#temp2): | a | b | |---|---| | 2 | 4 | | 2 | 5 | x | 3 | 1 | | 6 | 4 | x | 6 | 5 | | 7 | 5 | x | 7 | 4 | x |---|---| This is a table of transaction keys that I want to be deleted from another existing table. It represents transactions that negate other transactions, where a negates b or vice-versa. So I cannot have a single a negating multiple b or a single b negating multiple a. I have some logic that I thought would do it but there is a problem. With my

问题 I have 3 columns in a DataTable Id Name Count 1 James 4345 2 Kristen 89231 3 James 599 4 Suneel 317113 I need rows 1 and 3 gone, and the new datatable returning only rows 2 and 4. I found a really good related question in the suggestions on SO--this guy. But his solution uses hashtables, and only eliminates row 3, not both 1 and 3. Help! 回答1: I tried this Remove duplicates from a datatable.. using System.Data; using System.Linq; ... //assuming 'ds' is your DataSet //and that ds has only one

问题 I am trying to discover how great our problem is with duplicate code, therefore I need to be able to mail a nice report (HTML, PDF, or word) to everyone on the team that lists all the duplicates that are found. How do I create such a report? (At this stage, I am just looking for a one-of ad hock solution to help with scoping the problem) (Our codebase is in VB.NET and I am running on Windows 7) 回答1: Personally I would wrote a (Perl|Insert your choice of language here) program that takes the

问题 Question Answered Thank you Dan! Your code worked perfectly and you saved my life today! Many internets to you good sir. Original I was generously guided by the community to use LINQ to find duplicates on my listboxes the last time around. However, I am now in a tough spot because I need to find and remove duplicates from a multicolumn list view. I tried using LINQ but it says that the listview object is not "queryable". Is there a way for me to find and remove duplicates using only one

问题 Is there a generic SELECT statement to detect duplicate rows ("identical", where all columns are equal)? E.G, columns 2 & 4 in the following table titel | interpret | jahr -----------------------------------+------------------+----- Beauty | Ryuichi Sakamoto | 1990 Goodbye Country (Hello Nightclub) | Groove Armada | 2001 Glee | Bran Van 3000 | 1997 Goodbye Country (Hello Nightclub)| Groove Armada | 2001 Or do I need a SELECT which is specific to the table? Someone has given me an Sqlite d/b