remove duplicate rows in sql

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SQL Server uses stored procedures to remove duplicate rows of SQL statements

Check the code first. You can first read the SQL statement to remove duplicate records and obtain duplicate records.Copy codeThe Code is as follows:ALTER procedure [dbo]. [PROC_ITEMMASTER_GETUNIQUE] @ pageindex int, @ uid int, @ itemnumber varchar (50)ASBegin tran -- start transactionDrop table [ItemMaster]. [dbo]. [te

"StackOverflow problem Selection" in SQL to remove duplicate rows

Tags: sql StackOverflow de-weightproblemSuppose you have a table with a larger amount of data (for example, 300,000+ rows), where there are duplicate rows (other than the primary key, the other column data is the same), how do you quickly go heavy? My watch looks like this.MyTable-----------RowID int not null identity(

SQL Server to use stored procedures to remove duplicate rows _mssql

First the code, you can see the SQL statement to remove duplicate records, get duplicate records Copy Code code as follows: ALTER procedure [dbo]. [Proc_itemmaster_getunique] @PAGEINDEX int, @uid int, @itemnumber varchar (50) As Begin Tran--Start a transaction drop table [Itemmaster]. [dbo]. [Test

SQL statement tips: Remove duplicate rows

To remove duplicate row data from a table, you may immediately think of using the DISINTCT keyword. However, DISINTCT can only remove rows with the same columns in the table, if you need to remove rows with multiple fields in the

Several ways to remove duplicate rows in MS SQL

Tags: target div Delete sel not int nbsp article is your1. If there is an ID field, it is a unique fieldDelect table where ID not in (Select Max (ID) from table GROUP by col1,col2,col3 ...)The field followed by the GROUP BY clause is the condition you use to judge the repetition, such as only col1, so that the record is the same as long as the col1 field has the same contents.2, if you are judging all fields, you can do the same.SELECT * into #aa from table group by Id1,id2,....Delete TableINSER

Linux under uniq command to remove duplicate rows of examples

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

How to remove duplicate data rows from a file

1. Remove adjacent duplicate data rows $ Cat data1.txt | uniqOutput: Beijingwuhanbeijingwuhan 2. Remove all duplicate data rows $ Cat data1.txt | sort | uniqNote: Only the uniq command removes the adjacent

Remove duplicate rows with uniq

Repeated rows usually do not cause problems, but sometimes they do. In this case, you don't have to spend an afternoon preparing filters for them. The uniq command is a handy tool. Learn how it saves your time and energy. After sorting, you will find that some rows are duplicated. Sometimes this duplicate informatio

ASP. NET DataTable remove duplicate rows

ASP. NET DataTable remove duplicate rows This article mainly introduces two methods for removing duplicate rows from ASP. NET DataTable. This article will directly remove duplicated rows

How to remove duplicate rows from the matrix

There is a matrix in the form of a two-dimensional array. There are numbers and strings in each row of the matrix. How do I remove the same rows? The same row indicates that the values at all latitudes are the same. The solution I came up with is as follows: Concatenate the values of each row into a string and use the index of the row vector as the key. The time complexity should be O (n ). Traverse hasht

ASP. NET DataTable: Remove duplicate rows. asp. netdatatable

ASP. NET DataTable: Remove duplicate rows. asp. netdatatable First, use the Linq query expression. The code is as follows: DataTable testtable = new DataTable (); testtable. columns. add ("ID"); testtable. columns. add ("ProductName"); testtable. rows. add ("1", "1"); testtable.

Add strings in a column of different Oracle rows to remove duplicate values

) Remove duplicate English letters. The power of the function is needed here. (14) Write a function by yourself/*************************************** **************************************** *****Created by Zeng HaoCreation Time:Latest modifier: Zeng HaoLast modified:Purpose: Improve the split function,Achieve this effectEnter the string 123,123,234,345,234,345,456 and string,123,234,345,456 output*******

Merge two columns in multiple rows and remove duplicate Columns

-- Merge two columns in multiple rows and remove duplicate columns: Create Table TB (Col1 varchar (10 ), Col2 varchar (10 ), Col3 varchar (10 ), Col4 varchar (10 )) Go Insert TB select '200', '200', 'A', 1Insert TB select '200', '200', 'A', 1Insert TB select '200', '200', 'B', 2Insert TB select '200', '200', 'B', 2 GoCreate Function DBO. f_str (@ col3 varchar

Code _vbs to remove all duplicate rows from a text file in VBScript implementation

Ask:Hello, Scripting Guy! How do I remove all duplicate rows from a text file? --SW For:Hello, SW. You know, being a Scripting Guy means starting to find the ultimate solution to a given problem endlessly. (or at least when our manager asks why we never seem to really accomplish anything, we tell him this: "Boss, the never-ending search process takes time!") "Tha

PHP Remove duplicate rows in a text file _php tips

The example in this article describes how PHP deletes duplicate rows in a text file. Share to everyone for your reference. The specific analysis is as follows: This PHP function is used to delete duplicate rows in a file, to specify whether to ignore case, and to specify line breaks /** * Removeduplicatedlines *

Delete duplicate rows (duplicate data) in SQL, leaving only one row to go

Method One: Use in the programming of T-SQLAssign a column number, sort by col1,col2 combination, delete database duplicate rows (duplicate data), keep only one row//Col1,col2 is the database columnDelete a from (select Col1,col2,row_number () over (partition by col1,col2 ORDER by COL1) as RN from DATABASE) a where a.rn >1 method Two: Use in the ETL select distan

SQL Server Delete Duplicate Rows

There can is types of duplication of rows in a table1. Entire row getting duplicated because there is no primary key or unique key.2. Only primary key or unique key value is different and remaining all values are same.Scenario 1:delete duplicate rows without primary key or unique key.Let us create the following example.CREATE TABLE Customers1 (CustId Int, CustNam

How to delete duplicate rows in an SQL Server table

Original article: http://support.microsoft.com/kb/139444/SummaryThe Microsoft SQL Server table should not contain duplicate rows and non-unique primary keys. For the sake of conciseness, we sometimes refer to the primary key as "key" or "Pk" in this article, but this always indicates "primary key ". Repeated PK violates entity integrity and is not allowed in the

SQL statement to remove duplicate records, get duplicate records _mssql

SQL statements remove duplicate records, get duplicate records --Query a table to effectively remove duplicate records, UserID as a self-growing primary key, Roleid as a repeating field SELECT MIN (UserID) as UserID, Roleid from T

SQL Delete duplicate rows (all or distinct)

SQL Delete duplicate rows (all or distinct)/*Delete a duplicate row SELECT statement Use the all or distinct option to display all rows in the table that meet the criteria, or delete duplicate

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