deduplication

will find the Drugitem collection of Chinese documents to reduce, the explanation to remove the duplicate document.The problem has been solved, but I think it is still not appropriate, do we have to deal with it every time to get the final data? Is it possible to judge when inserting in a program (which may increase the insertion time) or to configure the set in advance? Because I first contact MongoDB, hope to have a master to see after giving guidance.Copyright NOTICE: This article for Bo Mas

Business Requirements:A table has the Id,n1,n2,n3 field, which is a new empty table,Table B has id,n1,n2,n3,n4,n5 fields, such as old tables containing data,Now the record of the N1,N2,N3 combination in B table is re-imported into a table, and a table primary key is also entered valueScenario: The records of B table after the query to go to the weight, while the results of the records are numbered, the sequence number as a table to insert the ID value, SQL statement as follows:INSERT INTO A表(id,

The method for de-duplicating Javascript arrays (four methods) and the four methods for de-duplicating Javascript arrays in the example code Four algorithms to achieve this goal: Method 1: Array. prototype. unique1 = function () {var n = []; // a

Repeated items in one-dimensional array: Use the array_unique function. Use the following example:Copy codeThe Code is as follows:$ Aa = array ("apple", "banana", "pear", "apple", "wail", "watermalon ");$ Bb = array_unique ($ aa );Print_r ($ bb

This article mainly summarizes the three common methods for removing js array duplicates. If you need some help, please refer to them.The first method is more conventional: 1. create a new array to store result 2. in the for loop, an element is

Php array de-duplicated function code. Copy the code as follows :? Phpfunctionassoc_unique ($ arr, $ key) {$ tmp_arrarray (); foreach ($ arras $ k $ v) {if (in_array ($ v [$ key], $ tmp_arr )) {unset ($ arr [$ k]);} else {$ tmp The code is as

Code Source: www.haowei.mearchives1147.html none? Phpfunctionunique ($ array) {if (! Is_array ($ array) | empty ($ array) returnfalse; foreach ($ arrayas $ v) $ vserialize ($ v); $ arrayarray_unique ($ array ); foreach ($ arrayas $ v) $ vun Source:

Suppose it is called array $ my_array;Copy codeThe Code is as follows:// Create an empty array.$ Tmp_array = array (); $ New_array = array (); // 1. Loop all rows. ($ val is a row)Foreach ($ my_array as $ k => $ val ){ $ Hash = md5 (json_encode ($

The mysql group by statement can be used to deduplicate a column. Directly run the following statement: Select io_dev_id from io_info where (TID = 1 AND host_name = 'ang1') group by 1;  Deduplicate query by io_dev_id. P: The difference between

This article describes how to deduplicate the number of uuid In the Python statistics file. The example analyzes Python Regular Expression matching and string operation related skills, for more information about how to deduplicate a uuid in a Python

Copy codeThe Code is as follows:Function assoc_unique ($ arr, $ key ){$ Tmp_arr = array ();Foreach ($ arr as $ k =>$ v ){If (in_array ($ v [$ key], $ tmp_arr )){Unset ($ arr [$ k]);} Else {$ Tmp_arr [] = $ v [$ key];}}Sort ($ arr );Return $ arr;}$

Quick de-duplication analysis of mysql tables with tens of millions of levels bitsCN.com quick de-duplication analysis of mysql tables with tens of millions of levels target: existing tables a and B, merge the data in the two tables to the c table.

Php efficiently removes array duplicates. This article is a simple and efficient code for removing duplicate values from one-dimensional arrays. For more information, see. The code is as follows: Copy the code? Php $ aarray (aCat, bDog, cCat); this

Quick sorting is a basic sorting algorithm. it is quite concise to use Python code, here we will take a look at a simple example of implementing a fast sorting algorithm and removing duplicates in Python: The sorting efficiency is the same as O (N *

My team lead looks like this: array (2) {[14] & amp; gt; array (6) {code ...}} [3] & amp; gt; array (6) {code ...}}} I want to change it to array (2) {[14] & amp; gt; array (6) {code ...}} [3] & amp; gt; array (6) {code ...}}}... my team lead looks

This article mainly introduces php 3D array de-duplication sample code in detail. if you need it, you can refer to it. I hope it will help you to assume that it is an array $ my_array; The code is as follows: // Create an empty array. $

If we are a one-dimensional data to repeat items do not say that there is a direct function, but the two-dimensional data PHP does not provide a function, the following small series to recommend two good two-dimensional array to repeat the custom

If you get a list of UID, the number is more than million lines, the format is as follows: Copy CodeThe code is as follows: 10001000 10001001 10001002 ...... 10001000 ...... 10001111 In fact, using the characteristics of the PHP array, very good

To remove duplicate values from the php array, I want to keep the key values of the Red Line & nbsp; only the following two key values & nbsp; how to implement array ------ solution ------------------ $ arrarray (, 42, php array remove duplicate

To remove duplicate values from the php array, I want to keep the key values of the Red Line & nbsp; only the following two key values & nbsp; how should I implement the array, $ arr = array (38,39, 41,38, 39,41, 42,43 php array remove duplicate