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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
Tags: PL/SQL Delete duplicate records--the database is used in the process due to procedural problems sometimes encounter duplicate data, duplicate data causes the database part of the settings are not set correctly ...Method OneDeclare @max integer, @id integerDeclare cur_r
Delete duplicate records and save the non-Repeated Records in table_name to # table_name Select distinct * into # table_name from table_nameDelete from table_nameSelect * into table_name from # table_nameDrop table # table_name This is related to the "select into" option, which can be in the database attributeIn the dialog box, check this item, or execute i
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
These are some useful SQL statements. For more information, see. These are some useful SQL statements. For more information, see. Delete duplicate records and save the non-Repeated Records in TABLE_NAME to # TABLE_NAME Select distinct * into # table_name from table_name De
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
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
)5. Search for redundant duplicate records (multiple fields) in the table, excluding records with the smallest rowidSelect * from vitaeWhere (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)Method 3: when registering a use
Tags: mybatis sql removal duplicate keep one recordThere are two meanings of duplicate records, one is a completely duplicate record, that is, all fields are duplicated records, and the second is some key field
Duplicate records may occur in the Database due to some reasons, such as user input or data import failure. if you do not use primary keys, constraints, or other mechanisms to implement data integrity, record them in your database. now let's look at how to delete these records in SQL SERVER 2008. First, we can simu
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: Selec
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: Selec
table tmp_wrap;Query OK, 0 rows affected (0.05 sec) 2. There is also a very streamlined approach. Find the duplicate and remove the smallest one. The Code is as follows: Delete users_groups as a from users_groups as,(Select *, min (id) from users_groups group by uid having count (1)> 1) As BWhere a. uid = B. uid and a. id> B. id;(7 row (s) affected)(0 MS taken) Query result (7 rec
repetitions) in less than 10 minutes.In fact, with the deletion method is relatively slow, may be the edge to find the reason for the deletion, and the use of temporary table, you can not duplicate the data ID to be selected to put in the temporary table, and then the table information by the temporary tables of the selected ID, they find to insert into the new table, and then delete the original table, so you canSQL statement removes
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 duplicate
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 records: Select stuid,stuname from stuinfo Gr
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
When the SQL statement deletes duplicate records and there is no size relationship between them, it processes repeated values. When the SQL statement deletes duplicate records and there is no size relationship between them, it pro
about 4 hours. 4 hours, a long time. It takes less than 10 minutes to insert 5 million data deduplication (1/2 duplicates) to a temporary table.Remove duplicate records from SQL statements and obtain duplicate records Search for duplic
(*) >1)5.Find redundant duplicate records (multiple fields) in the table, not including the smallest rowid records SELECT * FROM Vitae awhere (A.PEOPLEID,A.SEQ) in (select Peopleid,seq from Vitae GROUP by PEOPLEID,SEQ have count (*) > 1)and rowID not in (select min (rowid) from Vitae GROUP by PEOPLEID,SEQ have Count (*) >1) Delete from table name where fi
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