duplicates

What happens with duplicates when inserting multiple rows?

由 霸气de小男生 提交于 2019-11-27 07:03:21
问题 I am running a python script that inserts a large amount of data into a Postgres database, I use a single query to perform multiple row inserts: INSERT INTO table (col1,col2) VALUES ('v1','v2'),('v3','v4') ... etc I was wondering what would happen if it hits a duplicate key for the insert. Will it stop the entire query and throw an exception? Or will it merely ignore the insert of that specific row and move on? 回答1: The INSERT will just insert all rows and nothing special will happen, unless

Remove duplicate element pairs from multidimensional array

由 有些话、适合烂在心里 提交于 2019-11-27 07:02:15
问题 I have an array that looks like this: 1. coordinates = [ [16.343345, 35.123523], 2. [14.325423, 34.632723], 3. [15.231512, 35.426914], 4. [16.343345, 35.123523], 5. [15.231512, 32.426914] ] The latitude on line 5 is the same as on line 3, but they have different longitudes and are therefore not duplicates. Both the latitude and longitude are the same on line 3 and 6, and are therefore duplicates and one should be removed. 回答1: The difficulty in this question that different arrays never

ffmpeg - remove sequentially duplicate frames

由 百般思念 提交于 2019-11-27 06:58:35
Is there any way to detect duplicate frames within the video using ffmpeg . I tried -vf flag with select=gt(scene\,0.xxx) for scene change. But, it did not work for my case. Gyan Use the mpdecimate filter, whose purpose is to "Drop frames that do not differ greatly from the previous frame in order to reduce frame rate." This will generate a console readout showing which frames the filter thinks are duplicates. ffmpeg -i input.mp4 -vf mpdecimate -loglevel debug -f null - To generate a video with the duplicates removed ffmpeg -i input.mp4 -vf mpdecimate,setpts=N/FRAME_RATE/TB out.mp4 Th setpts

Removing duplicate words in a string in R

由 佐手、 提交于 2019-11-27 06:55:38
问题 Just to help someone who's just voluntarily removed their question, following a request for code he tried and other comments. Let's assume they tried something like this: str <- "How do I best try and try and try and find a way to to improve this code?" d <- unlist(strsplit(str, split=" ")) paste(d[-which(duplicated(d))], collapse = ' ') and wanted to learn a better way. So what is the best way to remove a duplicate word from the string? 回答1: If you are still interested in alternate solutions

jdbc: oracle database change notification & duplicate events

由 好久不见. 提交于 2019-11-27 06:35:20
问题 I need some Listener for any change(update, insert, delete) of Oracle database table. Problem: I get many detection by single update on my table. I think its oracle cache etc. Is it possible only real changes to detect? my code: import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.Properties; import oracle.jdbc.OracleConnection; import oracle.jdbc.OracleDriver; import oracle.jdbc.OracleStatement; import oracle.jdbc.dcn.DatabaseChangeEvent;

How to remove duplicates based on a key in Mongodb?

由 对着背影说爱祢 提交于 2019-11-27 06:24:55
I have a collection in MongoDB where there are around (~3 million records). My sample record would look like, { "_id" = ObjectId("50731xxxxxxxxxxxxxxxxxxxx"), "source_references" : [ "_id" : ObjectId("5045xxxxxxxxxxxxxx"), "name" : "xxx", "key" : 123 ] } I am having a lot of duplicate records in the collection having same source_references.key . (By Duplicate I mean, source_references.key not the _id ). I want to remove duplicate records based on source_references.key , I'm thinking of writing some PHP code to traverse each record and remove the record if exists. Is there a way to remove the

How to remove duplicates from a list using an auxiliary array in Java?

由 雨燕双飞 提交于 2019-11-27 06:19:26
问题 I am trying to remove duplicates from a list by creating a temporary array that stores the indices of where the duplicates are, and then copies off the original array into another temporary array while comparing the indices to the indices I have stored in my first temporary array. public void removeDuplicates() { double tempa [] = new double [items.length]; int counter = 0; for ( int i = 0; i< numItems ; i++) { for(int j = i + 1; j < numItems; j++) { if(items[i] ==items[j]) { tempa[counter] =

remove duplicate values based on 2 columns

由 ￡可爱￡侵袭症＋ 提交于 2019-11-27 06:16:54
问题 I want to remove duplicate values based upon matches in 2 columns in a dataframe, v2 & v4 must match between rows to be removed. > df v1 v2 v3 v4 v5 1 7 1 A 100 98 2 7 2 A 100 97 3 8 1 C NA 80 4 8 1 C 78 75 5 8 1 C 78 62 6 9 3 C 75 75 For a result of > df v1 v2 v3 v4 v5 1 7 1 A 100 98 2 8 1 C NA 80 3 8 1 C 78 75 4 9 3 C 75 75 I know I want something like: df[!duplicated(df[v2] && df[v4]),] but this doesn't work. 回答1: This will give you the desired result: df [!duplicated(df[c(1,4)]),] 来源：

Duplicate TCP traffic with a proxy

由 守給你的承諾、 提交于 2019-11-27 05:28:32
问题 I need to send (duplicate) traffic from one machine (port) and to two different machines (ports). I need to take care of TCP session as well. In the beginnig I used em-proxy, but it seems to me that the overhead is quite large (it goes over 50% of cpu). Then I installed haproxy and I managed to redirect traffic (not to duplicate). The overhead is reasonable (less than 5%). The problem is that I could not say in haproxy config file the following: - listen on specific address:port and whatever

Remove duplicate CSS declarations across multiple files

由 荒凉一梦 提交于 2019-11-27 05:28:15
问题 I'm looking to remove duplicate CSS declarations from a number of files to make implementing changes easier. Is there a tool that can help me do that? Right now I'm faced with something like this: styles.css #content { width:800px; height:1000px; background: green; } styles.game.css #content { width:800px; height:1000px; background: blue; } And I want this: styles.css #content { width:800px; height:1000px; background: green; } styles.game.css #content { background: blue; } The total number of
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