remove duplicate words

first to third path.#echo $PATH | Cut-d ': '-f 1-3/bin:/usr/bin:/sbin:Take the path variable out, I want to find the first to third, there is a fifth path.echo $PATH | Cut-d ': '-f 1-3,5/bin:/usr/bin:/sbin:/usr/local/binPractical Example: Display only/etc/passwd users and shells#cat/etc/passwd | Cut-d ': '-f 1,7 root:/bin/bashdaemon:/bin/shbin:/bin/shWCThe number of words in the statistics file, how many lines, how many characters.WC syntax[[email pr

Returns all words in a string $distinct =true remove Duplicates ?function Split_en_str ($str, $distinct =true) {Preg_match_all ('/([a-za-z]+)/', $STR, $match); if ($distinct = = True) {$match [1] = Array_unique ($match [1]);}Sort ($match [1]); osphp.com.cnreturn $match [1];}?> Get all Links ? function Get_all_url ($code) { Preg_match_all ('/Return Array (' name ' => $arr [2], ' URL ' => $arr [

, the Name field is repeated, and the other fields are not necessarily repeated or can be omitted. 1, for the first kind of repetition, easier to solve, usingThe code is as follows: SELECT DISTINCT * from TableNameYou can get a result set with no duplicate records. If the table needs to delete duplicate records (duplicate records retain 1), you can delete them as

temporary table than to remove it directly with one statement. At this time, people may jump out and say, what? You told us to execute this statement, and that's not to delete all the duplicates? And we want to keep the latest record in the duplicate data! Let's not worry, let me just talk about how to do this. In Oracle, there's a hidden automatic rowid that gives each record a single rowid, and if we wan

be unique for both fieldsSelect Identity(int,1,1) asAutoid,* into#Tmp fromTableNameSelect min(autoid) asAutoid into#Tmp2 from#TmpGroup byname,autoidSelect * from#TmpwhereAutoidinch(SelectAutoid from#tmp2)The last select is the result set that name,address not duplicate (but one more autoid field, which can be written in the SELECT clause without this column in the actual write)FourDuplicate querySelect * from where inch (Selectfromgroupby hascoun

Turn from Hibiscus bloghttp://blog.sina.com.cn/liurongxiu1211 SQL to remove duplicate statements(2012-06-15 15:00:01)SQL single table/multi-table query removes duplicate recordsSingle table DistinctMulti-table GROUP byGroup by must be placed before order by and limit, or it will be an error**************************************************************************

Now many people like to use the network disk to store some important files, or to share the files of others into their own network disk. But a long time will inevitably appear, some different names but the same content of the file, which will occupy too much disk space. So how do you quickly parse these duplicate files and remove them from the disk space? 　　1. Self-function Quick Scan Because many netizen

columns are added to resolve.2, this kind of repetition problem usually requires to keep the first record in the duplicate record, the operation method is as followsSuppose there is a duplicate field 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,autoidSEL

') if exists (SELECT * from tempdb. sysobjects where id=object_id (' tempdb. #Tmp1 ')) drop table #Tmp1Select ID as autoid, * into #Tmp1 from adminif exists (SELECT * from tempdb. sysobjects where id=object_id (' tempdb. #Tmp2 ')) drop table #Tmp2Select min (autoid) as autoid into #Tmp2 from #Tmp1 Group by Username,passwordif exists (SELECT * from dbo.sysobjects WHERE id = object_id (N ' admin ') and objectproperty (Id,n ' isusertable ') = 1) Drop tabl E adminSelect Id,username,password to admi

One, uniq what to do with the The duplicate lines in the text are basically not what we want, so we need to get rid of them. Linux has other commands to remove duplicate rows, but I think Uniq is a more convenient one. When using Uniq, pay attention to the following two points1, when manipulating text, it is typically used in combination with the sort command, b

the raw data (the number of records remains unchanged ), • Grouping is used to aggregate statistics on raw data (with fewer records, one record is returned for each group ). Note: When rank () over (order by sort field order) is used for sorting, the null value is the largest. (If the sorting field is null, the null field may be placed at the top of the list during sorting, which affects the correctness of sorting. Therefore, we recommend that you change dense_rank () over (order by column name

Seven examples of the uniq command: The uniq command in Linux can be used to process repeated lines in text files, this tutorial explains some of the most common usage of the uniq command, which may be helpful to you. The following file test will be used as a test file to explain how the uniq command works. $ Cat testaaaabbbbbbxx1. Syntax: $ uniq [-options] When the uniq command does not add any parameters, it will only remove

and uses the "People Information table" in the "Data 1" database as the data source for the data environment, and the situation of the database is already looking at the case study VFP: sample database is given in the article, the running interface is shown at the end of this article. Production steps: A new form, set its Caption property value to "Get started with programming-get rid of duplicate records in query results", set the AutoCenter prope

Seven examples of the uniq command: the uniq command in Linux can be used to process repeated lines in text files, this tutorial explains some of the most common usage of the uniq command, which may be helpful to you. The following File test will be used as the test file... seven examples of the uniq command: the uniq command in Linux can be used to process repeated lines in text files, this tutorial explains some of the most common usage of the uniq command, which may be helpful to you. The fol

Several ways to remove duplicate data from an array in iOSIn the work of the project we do not have to encounter, in the array when there is duplicate data, how to remove the duplicate data?First: Using Nsdictionary's AllKeys (allvalues) methodYou can save the elements in th

The function of PHP to remove duplicate values of an array can also be understood as removing duplicate values of an array. /*** the difference between the array and the Array_unique function: it requires Val to be a string, and this can be an array/object * * @param $arr the array to be drained * @param $reserveKey preserve the original key* @return array */fu

The distinct keyword can be used to remove duplicate rows from the results of the SELECT statement. If noDistinct: All rows, including duplicate rows, are returned. For example, if you select all author IDs in titleauthorDistinct, the following rows will be returned (including some repeated rows ): Use pubsSelect au_idFrom titleauthor The following is the result

Duplicate records have two meanings,　　　　 The first is a fully duplicated record, that is, all fields are duplicates of the recordSecond, some of the key fields are duplicated records, such as the Name field is repeated, and the other fields do not necessarily repeat or repeat can be ignored.1, for the first kind of repetition, easier to solve, usingSELECT DISTINCT * from TableNameYou can get a result set with no d