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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
Let's take a look at the following examples: Table tables Field 1 Field 2ID Name1 A2 b3 C4 C5 b The library structure is probably like this, this is just a simple example, the actual situation will be much more complicated. For example, I would like to use a statement query to get the name does not duplicate all the data, it must Use distinct to remove excess duplic
is easier to solve, use SELECT distinct* fromTableName can get a result set with no duplicate records. If the table needs to delete duplicate records (duplicate records retain 1), you can delete the select distinct as follows* IN
. Customer No. group by a. Customer No., B. company name ORDER BY no;2. SQL Server 2005 constructs the sequence number column Method 1:Select rank () OVER (order by customer No. DESC) AS No., customer No., company name FROM customer;Method 2:WITH TABLE(SELECT ROW_NUMBER () OVER (order by customer No. DESC) AS No., customer No., company name FROM customer)SELECT * FROM TABLEWHERE no. BETWEEN 1 AND 3;3. rowid
Delete duplicate records Presumably every developer has had a similar experience, and when querying or counting the database, the query and statistic results are inaccurate due to duplicate records in the table. The solution to this problem is to delete the
Nightmare for Developers--delete duplicate records Presumably every developer has had a similar experience, and when querying or counting the database, the query and statistic results are inaccurate due to duplicate records in the table. The solution to this problem is to d
In the system to a customer on-line found that there is a table of duplicate data, the results by troubleshooting code to find that there is a problem with the business logic, after modifying the code needs to be in the database of data deduplication on CSDN to find a solution,do not delete the database on the wire as much as possible, and you should back up the database regardless of any action on the database on the line --删除重复的记录 delete fr
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
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 duplicate data
SQL Single Table/multiple table query removal duplicate record single table distinct multiple table group byGroup byMust be placed inOrder byand limit before the error will be************************************************************************************1, duplicate records
: I created a table in ms SQL, but some records are repeated for various reasons.: The records are exactly the same.: Now I want to delete all the duplicates and only keep the first record.: I see oracle introduction in the database,Select distinct * into # table_name from table_nameDelete from table_nameSelect * into table_name from # table_nameDrop table # tabl
Label:Http://www.hanyu123.cn/html/c61/6790.html One, check a column (or more than one column) of the duplicate values. (You can only find the value of the duplicate record, cannot find the whole record information) For example: Find Stuid,stuname duplicate
min (autoid) as autoid into #Tmp2 from #Tmp Group by name,addressSELECT * 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, which can be written in the SELECT clause without this column in the actual write)OrWith Dups as(???? SELECT *, Row_number () over (partition by Product_code order by Product_code) as RowNu
Tags: class delete highlight top update duplicate record color Xiaomi dateInsert duplicates when inserting data accidentally todayThere are no primary key foreign keys in this table, you may insert or delete them arbitrarily.There's a lot of complicated statements on the web that don't solve the problem.Finally, use delete top (1) to solve the problemDelete Top (1from where='xiaomin'can also be usedUpdate Top (1) from the person where name = ' xxxx '
: I built a table in MS SQL, but some records were duplicated for a variety of reasons. : The record is exactly the same. : Now I want to delete all the duplicates and keep only the first one in the repeating record. : I saw an introduction to Oracle in the database. SELECT DISTINCT * to #table_name from table_name Delete from table_name SELECT * INTO table_name from #table_name drop table #table_name Relat
Count (*) G T 1) and rowID (select min (rowid) from Vitae GROUP by PEOPLEID,SEQ have Count (*) >1) Iv. Supplementary There are more than two duplicate records, one is a completely duplicate record, that is, all the fields are duplicate records, the second is some key fiel
For example:Id name value1 a pp2 a pp3 B iii4 B pp5 B pp6 c pp7 c pp8 c iiiId is the primary keyThis result is required.Id name value1 a pp3 B iii4 B pp6 c pp8 c iii Method 1Copy codeThe Code is as follows:Delete YourTableWhere [id] not in (Select max ([id]) from YourTableGroup by (name + value ))Method 2Copy codeThe Code is as follows:DeleteFrom table a left join (Select id = min (id) from Table group by name, value) B on a. id = B. idWhere B. id is null SQ
Wen/Xiachong Nightmare for Developers--delete duplicate recordsPresumably every developer has had a similar experience, and when querying or counting the database, the query and statistic results are inaccurate due to duplicate records in the table. The solution to this problem is to delete the
requires the result set to be unique for both fieldsSelect Identity (int,1,1) as Autoid, * into #Tmp fromTableNameSelect min (autoid) as autoid into #Tmp2 from #Tmp group byname,autoidSELECT * from #Tmp where autoid in (select Autoid 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 ac
redundant duplicate records (multiple fields) in the table, not including the smallest ROWID recordsSELECT * FROM Vitae awhere(A.PEOPLEID,A.SEQ) in (select Peopleid,seq from Vitae GROUP byPeopleid,seq having Count (*) > 1)and rowID not in (select min (rowid) fromVitae GROUP BY PEOPLEID,SEQ have Count (*) >1)TwoSayA field "name" exists in table A,and the "name" value may be the same between different
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