self-join – CodeRavo

Retrieving Maximum Value Rows per Group

Retrieving Maximum Value Rows per Group A common data manipulation task involves extracting rows that correspond … Retrieving Maximum Value Rows per GroupRead more

data-retrieval, database, group by, maximum-value, oracle, query optimization, self-join, SQL, subquery, window-functions

Identifying and Retrieving Duplicate Records in MySQL

Identifying and Retrieving Duplicate Records in MySQL Data duplication is a common issue in database management. … Identifying and Retrieving Duplicate Records in MySQLRead more

data integrity, Database Management, duplicate-records, group by, having, MySQL, self-join, SQL, subquery