Deleting duplicate records based on specific column(s) in Oracle, MySQL and MSSQL

  1. By using Group by and max(primary/unique key) or min(primary/unique key)-delete all records which are not in max(primary/unique key) or min(primary/unique key)
  2. By using self join with delete

Query to find out duplicate records

Oracle/MSSQL delete Query -By using Group by and min/max

MySQL delete Query -By using Group by and maxmin/max

Oracle/MySQL/MSSQL Delete Query -By using self join with delete

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