sql query to find duplicate records in column

. Customer number, A. Company name from customer as a, customer as B WHERE A. Customer number >= B. Customer number GROUP by a. Customer number, B. Company name order by serial number; 2. SQL Server 2005 construct ordinal column Method One: SELECT RANK (DESC) as serial number, customer number, company name from customer; Method Two: With TABLE as (SELECT row_number () over (DESC) as ordinal number, cust

There are four ways to delete duplicate records using SQL statements: How to delete records with the same fields and leave only one record. 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 th

A few days ago, I read the article in the SQL section of SCID and explained how to quickly delete duplicate records in SQL Server. I browsed it. The author used four methods: creating temporary tables, using cursors, and using unique indexes. After a while, I found that the method I used was the easiest. Good stuff can

MySQL Tutorial SQL distinct delete duplicate records How to use the DISTINCT keyword in MySQL to filter duplicate values in the result list of a SELECT statement If you want to delete duplicate data while querying the data, you can use the DISTINCT keyword to filter the

The following is an elaboration of the issue of duplicate record deletion. There are two duplicates of the record, one is a completely duplicate record, that is, all the fields are duplicate records, the second is some key fields duplicate

server| Repeat | Repeat the following to illustrate the issue of duplicate record deletion. There are two duplicates of the record, one is a completely duplicate record, that is, all the fields are duplicate records, the second is some key fields duplicate

Copy Code code as follows: Delete weibotopics where ID in (select MAX (Id) from Weibotopics GROUP by Weiboid,title has COUNT (*) > 1); SQL: Delete duplicate data, keep only one SQL statement, delete duplicates only one in thousands of records, there are some of the same

), you can delete them as follows SELECT DISTINCT * to #Tmp from TableName drop table TableName SELECT * Into TableName from #Tmp drop table #Tmp This 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 follows Suppose there is a

redundant duplicate records in the table (multiple fields) The code is as follows:Copy code Select * from vitae a where (a. peopleId, a. seq) in (select peopleId, seq from vitae group by peopleId, seq having count (*)> 1) 4. Delete redundant record (multiple fields) in the table, leaving only the records with the smallest rowidDelete repeated

Can I retrieve the total number of records in each column in one query? MySQL has a field: class_idclass_id11222533 ...... How to query each column at a time (or efficiently) to obtain the total number of records of each

The following describes how to delete duplicate records.There are two Repeated Records. One is a completely repeated record, that is, records with all fields being repeated, and the other is records with duplicate key fields, such as dup