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I asked ChatGPT: write sql to delete duplicate records in Oracle database table called employee, for duplicate employee_id

ChatGPT: To delete duplicate records in Oracle database table called employee for duplicate employee_id, you can use the following SQL query:

DELETE FROM employee 

WHERE ROWID NOT IN 

(

 SELECT MAX(ROWID) 

 FROM employee 

 GROUP BY employee_id

);

Explanation:

• The ROWID is a pseudo-column that represents the physical address of a row in a table.
• The MAX function is used to select the row with the highest ROWID for each group of employee_id.
• The GROUP BY clause is used to group the records by employee_id.
• The NOT IN operator is used to exclude the rows with ROWID that are not in the subquery.
• The subquery selects the maximum ROWID for each group of employee_id.

This query will delete all the duplicate records in the employee table for each employee_id, and keep only the record with the highest ROWID.