duplicate-removal

问题 Consider my datatable, Id Name MobNo 1 ac 9566643707 2 bc 9944556612 3 cc 9566643707 How to remove the row 3 which contains duplicate MobNo column value in c# without using LINQ. I have seen similar questions on SO but all the answers uses LINQ. 回答1: The following method did what i want.... public DataTable RemoveDuplicateRows(DataTable dTable, string colName) { Hashtable hTable = new Hashtable(); ArrayList duplicateList = new ArrayList(); //Add list of all the unique item value to hashtable,

问题 I have a taccounts table with columns like account_id(PK) , login_name , password , last_login . Now I have to remove some duplicate entries according to a new business logic. So, duplicate accounts will be with either same email or same ( login_name & password ). The account with the latest login must be preserved. Here are my attempts (some email values are null and blank) DELETE FROM taccounts WHERE email is not null and char_length(trim(both ' ' from email))>0 and last_login NOT IN (

问题 I have collected the following file: 20130304;114137911;8051;somevalue1 20130304;343268;7591;NA 20130304;379612;7501;somevalue2 20130304;343380;7591;somevalue8 20130304;343380;7591;somevalue9 20130304;343212;7591;NA 20130304;183278;7851;somevalue3 20130304;114141486;8051;somevalue5 20130304;114143219;8051;somevalue6 20130304;343247;7591;NA 20130304;379612;7501;somevalue2 20130308;343380;7591;NA This is a ; seperated file with 4 columns. The combination of column 2 and 3 however must be unique

问题 I would like to know the simplest javascript method for removing duplicate values (coordinates) from a large GeoJSON collection (approx 100k lines). After removing the duplicate values I would like to log the updated collection to the console or display the result on a webpage. A sample of my attempt is below, however all I am getting in the console is an empty array. window.onload = init; function init() { function eliminateDuplicates(arr) { var i; var len = arr.length; var out = []; var obj

问题 I am struggling with something that should be fairly straightforward, however, I have read at least 15 methods of doing this and cannot seem to get it to work. Here is a sample dataset: 9:30:01 584.7 9:30:01 590 9:30:01 595 9:30:02 584.51 9:30:03 584.62 9:30:04 584.44 9:30:05 584.05 I only want one row per second, so of the first 3 rows, only one needs to stay. I don't care if it is the first or the last, but the code I have been using keeps the last, 595 in this case. The way I am doing it

问题 Just want to remove duplicates. Pool is vector<pair<string, int>> but I seem to miss some elements at the start of the vector somehow. Can anyone verify the logic of the removal? Thanks :) Pool Master::eliminateDuplicates(Pool generation) { for(int i = 0; i < generation.size(); i++) { string current = generation.at(i).first; for(int j = i; j < generation.size(); j++) { if(j == i) { continue; } else { string temp = generation.at(j).first; if(current.compare(temp) == 0) { Pool::iterator iter =

问题 While duplicated row (and column) names are allowed in a matrix , they are not allowed in a data.frame . Trying to rbind() some data frames having row names in common highlights this problem. Consider two data frames below: foo = data.frame(a=1:3, b=5:7) rownames(foo)=c("w","x","y") bar = data.frame(a=c(2,4), b=c(6,8)) rownames(bar)=c("x","z") # foo bar # a b a b # w 1 5 x 2 6 # x 2 6 y 4 8 # y 3 7 Now trying to rbind() them (Pay attention to the row names): rbind(foo, bar) # a b # w 1 5 # x

问题 One of the question asked in an interview was, One table has 100 records. 50 of them are duplicates. Is it possible with a single query to delete the duplicate records from the table as well as select and display the remaining 50 records. Is this possible in a single SQL query? Thanks SNA 回答1: with SQL Server you would use something like this DECLARE @Table TABLE (ID INTEGER, PossibleDuplicate INTEGER) INSERT INTO @Table VALUES (1, 100) INSERT INTO @Table VALUES (2, 100) INSERT INTO @Table

问题 I have a dataset, there are duplicate observations, how to keep the unique observation? ID Date Type 1 201301 A 2 201308 B 4 201303 R 1 201301 A 3 201305 C 2 201308 B What I want is: ID Date Type 1 201301 A 2 201308 B 4 201303 R 3 201305 C I tried the unique & duplicated function. But it didn't work. dataset[which(dataset$ID %in% unique(dataset$ID)),] # will keep all the row dataset[!duplicated(dataset$ID),] #will only keep the ID=3,4,as follows ID Date Type 4 201303 R 3 201305 C How can I

问题 I use the following expression in Notepad++ to delete duplicate lines: ^(.*)(\r?\n\1)+$ The problems are: It is only for single word lines, if there is space in a line it won't work. It is only for consecutive duplicate lines. Is there a solution (preferably regular expression or macro) to delete duplicate lines in a text that contains space, and that are nonconsecutive? 回答1: Since no one is interested, I will post what I think you need. delete duplicate lines in a text that contains space,