how to remove duplicate rows in sql

) 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: 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

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

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 *

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

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

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 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)/*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