How can duplicates be eliminated from a query that has undergone LEFT JOIN?

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One way to eliminate duplicates from a query that has undergone LEFT JOIN is to use the DISTINCT keyword in the SELECT statement. This will return only distinct or unique values in the result set. Alternatively, you can use the GROUP BY clause to group the results by a specific column or set of columns, and use aggregate functions like COUNT() or SUM() to get unique values for other columns. Additionally, you can use the INNER JOIN keyword instead of LEFT JOIN if you only want to retrieve records that have matching values in both tables.