delete duplicate rows in sql

= 2Set @ startpage = 1Set @ SQL = 'select top '+ STR (@ endpage-@ startpage + 1) + 'from DBO. Employees where RID not in (select top'+ STR (@ startPage-1) + 'rid from DBO. Employees where RID> 1 )'Exec sp_executesql @ SQL-- Range QuerySelect * From DBO. Employees where birthdate between '2017-01-01 'and getdate ()Select * From DBO. Employees where birthdate not between '2017-01-01 'and getdate ()--

For example, the table test contains the ID and name fields. If there are records with the same name, only one record is left, and the remaining records are deleted. The content of the name is not fixed, and the number of identical records is not fixed. Solution 1: 1. Record Repeated Records in Table temp1: Select [flag field ID], count (*) into temp1 from [Table name]Group by [flag field ID]Having count (*)> 1 2. Record non-Repeated Records in Table temp1: Insert temp1Select [flag fie

How can I delete duplicate data when there are duplicate records in the database table? Of course, the premise is the repeated definition: In the database table, we think that one or more fields are the same, then we think this record is repeated. See the following table: Rowid Dep_id Dep_name Company Aaarj4aaeaaabegaaa 13 Person

There are several identical records in thousands of records. How can I use SQL statements to delete duplicates?1. Search for redundant duplicate records in the Table. duplicate records are determined based on a single field (peopleid ).Select * from peopleWhere peopleid in (select peopleid from people group by peopleid

The following is a general t-SQL template for this operation: /* Delete from a from -- delete Table A (a is the referenced table to be deleted)(Select row_number () over -- row_number () over is an auto-incrementing column generated from the beginning.(Partition by repeat column 1, repeat column 2, repeat column 3 --, repeat column N partition by is similar to

Tags: where ideas group art over SEL repeat minimum order byThe first few days of work, there is a small need to delete a table table_a duplicate records (keep one), assuming that the field col_pk repetition to determine the record duplication, then there are several ways: In Oracle, you can use ROWID to delete, which is a very efficient way of writing:

Business: A table contains a lot of data (ID is the auto-incrementing primary key), and some of the data contains duplicate data. Objective: To delete the duplicate data and retain the data inserted for the first time, and keep other data unaffected. Problem solving process: Step 1: Find the ID (save_id) of all data to be retained) SELECT id as save_id FROM yuj

SQL Delete duplicate dataThis article provides a MySQL delete duplicate data, is the data table there are more than two duplicate data, delete the smallest number of a piece of informat

With SQL statements, delete duplicates and keep only one In thousands of records, there are some of the same records, how can you use SQL statements to delete duplicates? 1, look for redundant records in the table, duplicate records are based on a single field (Peopleid) t

Label:Mesh: Zdjz_dis The NAME field has a duplicate value, delete the duplicate value deleted * from zdjz_dis WHERE name in (select Name from Zdjz_dis GROUP by NAME has count (NAME) >1); The above procedure will remove all the same values, including the one you want, and delete the

During this time, the project needs to import the original data to the new database, and the duplicate data needs to be deleted. I use the cursor method to solve this problem. The SQL statement is as follows to avoid forgetting. Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> -- Delete

Tags: play statement span IDE pen proc Height GROUP by view1: Delete duplicate data --First step: Find duplicate Data firstSelectProcinstid fromRecord_errorlog GROUP BY Procinstid have Count (Procinstid)>1--Take a lookSelect* fromRecord_errorlogwhereProcinstidinch(SelectProcinstid fromRecord_errorlog GROUP BY Procinstid have Count (Procinstid)>1); --The second p

IF object_id('Carddetail') is not NULL DROP TABLECarddetailCREATE TABLECarddetail (IDINT IDENTITY(1,1)PRIMARY KEY, CardnoVARCHAR(8), NAMEVARCHAR( -), IdcardVARCHAR( -), CardstateCHAR(1)--card Status 1 Normal 2 logoff ) INSERTCarddetail (cardno,name,idcard,cardstate)VALUES ('001','Zhang San','31010',1), ('005','Zhang San','31010',1), ('002','John Doe','31011',1), ('003','Harry','31012',1), ('006','Zhang San','31010',0), ('004','Harry','31012',1), ('007','Ouyang','31013',1), ('008','Ouyang','3

: I built a table in MS SQL, but for a variety of reasons some records are duplicated : The record is exactly the same. : Now I want to delete the duplicates, just keep the first one in the duplicate record. : I seem to have seen a presentation of Oracle in the database, SELECT DISTINCT * INTO #table_name table_name Delete