What is the method for removing duplicate entries and calculating sum in SQL?

To eliminate duplicates and calculate the sum, you can use SQL’s DISTINCT and SUM functions together.

For example, if there is a table named table1 that has a column named column1, to remove duplicates and sum the values of that column, the following SQL statement can be used:

SELECT DISTINCT column1, SUM(column1) 
FROM table1 
GROUP BY column1;

This way, we can eliminate duplicates and sum the values in column1.