group by name

Oracle Delete duplicate rowsCategory: ORACLE2010-12-12 17:10423 people readComments (0)CollectionReportOracletabledeleteintegerinsert.netSQL statement for querying and deleting duplicate records1, look for redundant records in the table, duplicate

Mesh: Zdjz_dis The Name field has a duplicate value, delete the duplicate value of delete *from zdjz_diswhere name in (the select name from Zdjz_dis GROUP BY NAME has count (name) >1); The above practice removes all the same values, including the

1, in the interview encountered a problem, is to write a table with ID and name two fields, query out the name duplicate all data, now listed below:SELECT * FROM Xi a WHERE (a.username) in (select Username from XI Group by username have count (*) > 1

Original: SQL Server gets the highest value of data in each category/* Data as follows: Name Val Memo a 2 A2 (second value of a) a 1 a1--a first value a 3 a3:a third value B 1 b1--b first value B 3 b3:b third value B 2 b2b2b2b2 B 4 b4b4 B 5

1. Duplicate records can be identified by a single field: ID 1 and the name of ID 6SELECT * FROM student where name in (select name from student Group by name H aving COUNT(name) >1)In operator: Allows multiple values to be specified in the WHERE

**************************************** * ******************* About: MSSQLServer2000 repeat sorting * Author: ZHUSHAN time: 2007-02-2811: 36 * test environment: SQLServer2000SP4 + Windows2000Sp1 ************************************* ***************

If you like these articles, click here to subscribe to this BlogMySQL Method for querying and deleting duplicate records (1) 1. Find excess duplicate records in the Table. duplicate records are based on a single field (peopleId) select *

Logical execution sequence analysis of SELECT statements in the database Introduction This is not a deep technical question, but a cool programming capability. This is not directly related to a person's development capabilities, but knowing this

SQLsetpages100lines120SQLSELECTDISTINCTDECODE (NAME, NULL, NULL, NAME) FROMV $ ARCHIVED_LOG; DECODE (NAME, NULL, NULL, NAME) implements NULLSQLSHOWPARAMETERLOG_ARCHIVE_DEST_1N SQL set pages 100 lines 120 SQL SELECT DISTINCT DECODE (NAME, NULL, 'null'

This article provides a large number of SQL statement statements for deleting duplicate records. If you are worrying about how to delete duplicate data in the database, we provide you with a variety of SQL query statements for deleting duplicate

1. Search for redundant duplicate records in the Table. duplicate records are determined based on a single field (peopleId ).Copy codeThe Code is as follows:Select * from peopleWhere peopleId in (select peopleId from people group by peopleId having

This article uses two simple examples to add restrictions to the group after groupby and query the number of repeated occurrences of a field in the data table. The havaing and groupby statements are sorted by the number of times. This article uses

In SQL, we often encounter repeated data. Below I will introduce multiple methods for deleting Repeated Records in mysql. If you need it, please refer to it. In SQL, we often encounter repeated data. Below I will introduce multiple methods for

The groupby method of the previous orm is no longer available in django1.8 and must be implemented using annotate. The first values is used to select the fields to be used for groupby (groupbyuser_id here), followed by annotate to group and

The implementation code is as follows: The code is as follows:Copy code SELECT *FROM [extract]. [dbo]. [tbTradeFullinfoGet] WHERE tid IN(SELECT tidFROM [extract]. [dbo]. [tbTradeFullinfoGet]Group by tidHaving count (tid)> 1) order by tid

How can I find data with the same name? Table Aid & nbsp; name & nbsp; kemu1 & nbsp; & nbsp; Zhang Long & nbsp; Composition 2 & nbsp; & how does nb find data with the same name? Table Id name kemu 1 Zhang Long's composition 2 Zhang Long's

1. During the interview, I encountered a problem. I wrote a table with two fields, ID and name, to query all the data with duplicate names. The column is: Select * from Xi A where (A. username) in (select username from Xi Group by username having

Table A: ID Name banji_id//banji_id is the ID of table B 1 Zhang Long 1 2 Zhang Long 2 3 Li 41 3 Li 45 5 Wang 53 6 Zhao Hu 2 7 Zhao Hu 1 8 Zhaohu 4 Table B: ID km SJ1 SJ2 1 Abacus Mental Arithmetic 2015 spring 2 Eloquence 2015 Spring 3 Composition

SQL Server groups the data of the row where the maximum (small) value is located by a field, and groups the data of the row where the maximum (small) value is located by a field. yan Hua (the snow and snow in the past 18 years) 2007-10-23 in

How to delete duplicate records in a table and retain only one of them [posting 12:02:05] font size: large, medium, and small There are several identical records in thousands of records. How can I use SQL statements to delete duplicates? Thank you!1.