veeam deduplication

(*) from gczbxx_zhao t group by gcmc, gkrq having Count (*)> = 1 order by GKRQ) Select * from gczbxx_zhao where viewid in (select max (viewid) from gczbxx_zhao group Gcmc) order by gkrq desc --- this is feasible. .One question says: the efficiency of distinct deduplication is very low. I saw this article on the Internet as if it was very efficient to use group by having?In a test, I have a product table with 0.26 million records. Only the product num

ZOJ question 2734 Exchange Cards (DFS deduplication OR primary function) Exchange Cards Time Limit: 2 Seconds Memory Limit: 65536 KB As a basketball fan, Mike is also fond of collecting basketball player cards. but as a student, he can not always get the money to buy new cards, so sometimes he will exchange with his friends for cards he likes. of course, different cards have different value, and Mike must use cards he owns to get the new one

004 string deduplication (keep it up), 004 keep Design algorithms and write code to remove repeated characters in strings. No extra cache space is available. Note: one or two additional variables can be used, but an additional array copy is not allowed. Simple question: #include Keep it up writes several algorithm questions every week, entertainment! What is keep it up? Keep upPersistence; maintenance; continue; Do not low; do not bend (disease, et

// Array Function Extension array. prototype. each = function (FN) {fn = FN | function. k; var A = []; var ARGs = array. prototype. slice. call (arguments, 1); For (VAR I = 0; I This article from the "Dream think Xi" blog, please be sure to keep this source http://qiangmzsx.blog.51cto.com/2052549/1549392 Array Function Extension-difference set, Union set, collection, deduplication

functionremoverepetition (str) {varresult = "", Unstr; for(vari=0,len=str.length;i){ //because UNSTR is always the previous letter of the current Str.charat (i) because the assignment of Unstr Unstr=str.charat (i) is done in the previous cycle //so you can delete the place where it repeats. if(Str.charat (i)!==unstr) {Unstr=Str.charat (i); Result+=Unstr; Console.log (result); } } returnresu

Let's say we have a MongoDB collection, Take this simple set as an example, we need to include how many different mobile phone numbers in the collection, the first thought is to use the DISTINCT keyword, Db.tokencaller.distinct (' Caller '). length If you want to see specific and different phone numbers, then you can omit the length property, since Db.tokencaller.distinct (' Caller ') returns an array of all the mobile phone numbers. However, this approach is sufficient for all situations.

name,address, which requires the result set to be unique for both fieldsSelect Identity (int,1,1) as Autoid, * into #Tmp from TableNameSelect min (autoid) as autoid into #Tmp2 from #Tmp Group by name,autoidSELECT * from #Tmp where autoid on (select Autoid from #tmp2) The last select is the result set that name,address not duplicate (but one more autoid field that can be written when actually writing Omit this column in the SELECT clause) (iv) Duplication of queriesSELECT * FROM tablename where

groupedSuch as:-The total number of girls and boys receivedSelect Sex,count (*) from Student GROUP by sexOrder of Query statements:Select from where the group by has an order byNote: Where is the filter for the source data. It can only use columns that are referred to in the table following the fromAn aggregate function cannot be used after a where condition, and an error will be made if usedHavingIf you are filtering the result set after grouping, then you need to have a having, because the wh

1, use distinct to weight (suitable for querying the total number of the whole table)There are multiple schools + teachers to contribute, need to count the total number of authorsSelectcount (author)As total from files each author has a lot of contributions, there are duplicate records here. Selectdistinctauthor from files;It is possible that the names of teachers in both schools are the same, and only one error is counted. SelectdistinctAuthor,sid the combined unique value of the From files sta

Tag: equals code uses element delete to perform dev repeat hashTo insert into the database go to weight: 1. Iterate through the list you have read 2. Get the data you need to query before you insert the method into the database, execute the Query method 1 devlist=devicedao.finddevice (Device.getrfid ()); 2 if (Devlist.size () >0) { 3 messagestr = "Duplicate data, please re-import!" "; 4 5 } Else { 6 devicedao.save (device);

)Create Tabletmp_relationship_id as(Select min(ID) asId fromRelationshipGroup bySource,target having Count(*)>1)Create an indexAlter Table Add index name (field name)DeleteDelete from Relationship where not inch (Select from tmp_relationship_id) and inch (Select from relationship)2.2 Quick MethodIn practice, it is found that the above method of removing field duplication, because there is no way to rebuild the index for multiple fields, resulting in large data volume is very inefficient, lo

of the above mechanism, using the drop of a table or delete data, the space will not be self-Recycle, for some of the tables that are determined not to be used, when removing the space at the same time, there are 2 ways to do this:1, the use of Truncate method for truncation. (But data recovery is not possible)2. Add purge option at drop: drop table name purgeThis option also has the following uses:You can also delete the table permanently by deleting the recyclebin zone, and the original delet

Phpmysql removes duplicate data from millions of data records .? PHP Tutorial defines a number of groups, used for storing the final result resultarray(when reading the uid.pdf file, fpfopen(test.txt, r); while (! Feof ($ fp) {$ uidfgets ($ fp); $ ui // Define an array to store the results after deduplication $ Result = array (); // Read the uid list file $ Fp = fopen('test.txt ', 'r '); While (! Feof ($ fp )){$ Uid = fgets ($ fp );$ Uid = trim ($ ui

Hadoop written questions: Identify common friends of different people (consider data deduplication) Example: Zhang San: John Doe, Harry, Zhao Liu John Doe: Zhang San, tianqi, Harry The actual work, the data to reuse is still quite a lot of, including the empty value of the filter and so on, this article on data deduplication and inverted index detailed explanation. first, data

Welcome to the Linux community forum, and interact with 2 million technical staff to enter the GROUPBY statement to implement deduplication query for a certain column. Directly run the preceding statement: selectio_dev_idfromio_infowhere (Tyang1) GROUPBY1; deduplication by io_dev_id. P: add it with ORDERBY and disti. Welcome to the Linux community forum and interact with 2 million technical staff> enter the

Research on Big Data de-duplication in hive inventory table: store incremental table: inre field: 1. p_key remove duplicate primary key 2. w_sort sort by 3.info other information method 1 (unionall + row_number () over): insertoverwritetablelimao_storeselectp_key, sort_wordfrom (selecttmp1. *, row_num Research on Big Data de-duplication in hive inventory table: store incremental table: inre field: 1. p_key remove duplicate primary key 2. w_sort sorting is based on 3. other info information metho

During project development, arrays often contain a lot of repeated content, that is, dirty data removal operations. This article focuses on several methods of array deduplication. For more information, see. 1.According to the principle that keys in js objects are not repeated, the method of removing duplicates from arrays is conceived. The most common thinking is as follows: The Code is as follows: Function distinctArray (arr ){Var obj = {}, temp =

Select * From dc_restaurants; 31 Select distinct (restaurant_name), ID from dc_restaurants; 31 (deduplication will be performed based on the ID and specified ant_name) Select distinct (restaurant_name), ID from dc_restaurantsGroup by comment ant_name; 17 Select distinct ant_name, ID from dc_restaurantsGroup by comment ant_name; 17 -- Deduplication based on a field: 1. Group by (do not pay attention

Summary of deduplication methods for javascript Arrays Summary of deduplication methods for javascript Arrays Array deduplication is a common requirement. We will temporarily consider repeated arrays of the same type. It mainly aims to clarify the ideas and consider the performance. The following methods are available on the Internet. Here is a brief summary. Sum

Three methods and code examples for removing the deduplication of JavaScript Arrays This article mainly introduces three methods and code examples for de-duplicating JavaScript arrays. This article provides the instance Code directly. For more information, see There are many methods to deduplicate arrays. it is unclear which one is the best. So I tested the effect and performance of array deduplication. Tes