sql query to find duplicate records in column

the table design is not weekly. You can add a unique index column. 2. Repeat problems usually require that the first record in the repeat record be retained. The procedure is as follows: Assume that the duplicate fields are Name and Address. You must obtain the unique result set of the two fields. select identity(int,1,1) as autoID, * into #Tmp from tableName select min(autoID) as autoID into #Tmp2 from #

duplicate key fields, such as duplicate Name fields, other fields are not necessarily repeated or can be ignored. 1. For the first type of repetition, it is easier to solve. ? 1 Select distinct * from tableName You can get the result set without repeated records. If the table needs to delete duplicate

select * from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1) Iv. Supplement There are more than two duplicate records. One is a completely repeated record, that is, record with all fields already exists. The other is record with

1. -- query the duplicate value of a column (or multiple columns) (only the value of the duplicate record can be found, not the information of the entire record) -- For example, query records with repeated item_no and item_subno

There is a field "name" in Table A,and the "name" value may be the same between different records,Now you need to query the records in the table, the "name" value duplicates the item;Select Name,count (*) from-A Group by Name has Count (*) > 1If the same gender is also the same large as the following:Select Name,sex,count (*) from-A Group by Name,sex have Count (

duplicate records)-- The premise of such a score is: there must be a non-repeated column, in this example, recno-- For example, query records with duplicate stuidSelect * From stuinfo S1Where recno not in (Select max (recno) from

SQL statement to query duplicate records and delete Repeated Records Search for records with all repeated titles: Select * From t_info A where (select count (*) from t_info where title = A. Title)> 1) Order by title DESC I. Searc

SQL statements remove duplicate records, get duplicate records --Query a table to effectively remove duplicate records, UserID as a self-gr

There are often repeated records in the database. sometimes I want to query duplicate records and display them, and sometimes I want to delete them. next I will introduce how to delete and query duplicate

This article describes three SQL statements for querying duplicate records and deleting duplicate records. Each of them uses different methods to illustrate other functions, feasibility, and efficiency. This article describes three SQL