Skip to main content

Identify the duplicates in MySQL

To identify the duplicate entries in MySQL, use below query.

                     SELECT COUNT(*) as repetitions, group_concat(id, ' (', startTime, ', ', endTime, ') ' SEPARATOR ' | ') as row_data FROM GROUP BY startTime, endTime HAVING repetitions > 1

FYI,
  1. id, startTime and endTime columns should be changed based on your table schema.
  2. you can change the output format here like alias and the separator.
Labels:

Comments

Post a Comment

Popular posts from this blog

Table and its count

Table and its count To view all tables and its count by executing command and immediately, use below commands - MSSQL SELECT      sc. name   + '.' + ta. name   TableName,  SUM (pa. rows ) RowCnt FROM      sys.tables ta INNER   JOIN   sys.partitions pa      ON   pa.OBJECT_ID = ta.OBJECT_ID INNER   JOIN   sys.schemas sc      ON   ta.schema_id = sc.schema_id WHERE   ta.is_ms_shipped = 0  AND   pa.index_id  IN   (1,0) GROUP   BY   sc. name ,ta. name ORDER   BY   SUM (pa. rows )  DESC  
Post a Comment
Read more