how to eliminate duplicate records in sql

. We'll use the Common Table Expression (CTE) and put the ' self ' Join query in it.With duplicates as (select distinct A.custid as customer_id from Customers2 a join customers2 B on A.custid Let ' s check which rows got deleted.SELECT * from Customers2 goScenario 2.b:delete all duplicate records but keep the first original oneLet ' s first truncate the CUSTOMERS2 table and add the same rows again.Truncate

In SQL Server, we sometimes need to obtain one of multiple duplicate data records. For more information, see the following statement. In SQL Server, we sometimes need to obtain one of multiple duplicate data records. For more inf

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

TableNamedrop table TableNameSELECT * Into TableName from #Tmpdrop table #TmpThis duplication occurs because the table is poorly designed and the unique index 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

Label: With SQL statements, delete duplicates only keep one In thousands of records, there are some same records, how can you use SQL statements, delete duplicates1, look for redundant records in the table,

SQL: delete duplicate data. Only one record is retained. SQL2010-09-10 16:03:33 Read82 Comment0 Font Size:LargeMediumSmallSubscription There are some identical records in thousands of records. How can I use SQL statements to delete duplicates? 1. Search for redundant

In thousands of records, there are some same records, how can you use SQL statements, delete duplicates1, look for redundant records in the table, duplicate records are based on a single field (Peopleid) to determineSELECT * from

In thousands of records, there are some same records, how can you use SQL statements, delete duplicates1, look for redundant records in the table, duplicate records are based on a single field (Peopleid) to determineSELECT * from

also a very streamlined approach. Look for duplicates and get rid of the smallest one. The code is as follows Copy Code Delete Users_groups as a from users_groups as a,(Select *,min (ID) from Users_groups GROUP by UID has count (1) > 1) as Bwhere A.uid = B.uid and a.id > b.id;(7 row (s) affected)(0 ms taken)Query result (7 records)ID UID GID1 11 5022 107 5023 100 5034 110 5015 112 5016 104 5029 102 501 3. Now l

Tags: SQL class tab packet reserved BSP count implementation modified1. Check out duplicate recordsSelect Duplicate Record field form data table group by repeating record field having count (repeating record field) >1 2. Duplicate records show only one record with a minimum

(*) >1--Delete the maximum number of IDs in duplicate records (if more than 2 duplicate records are executed multiple times)If the table data is exactly the same, you can import the data into a temporary table firstOrDelete from table where ID not in (Select min (id) from table group by name)--Keep only the first one

MySQL queries duplicate data in a table. For example, if you need to query records with duplicate bar codes in the table, add the HAVING clause in SQL because the WHERE keyword cannot be used with the aggregate function. MySQL queries duplicate data in a table. For example,

Tags: update repeat number post does not contain tle based on row containing pluralWith SQL statements, delete duplicates only keep one In thousands of records, there are some same records, how can you use SQL statements, delete duplicates1, look for redundant records