How to Retrieve Rows with the Minimum Value for Each Dealer in MySQL?

MySQL: Retrieving Rows with the Lowest Value for Each Dealer

The task at hand involves fetching the rows with the lowest values for each distinct dealer from a database table containing columns like id, name, value, and dealer.

Strategy:

To solve this problem, two solutions are presented below:

Solution 1:

SELECT t1.*
FROM your_table t1
JOIN (
    SELECT MIN(value) AS min_value, dealer
    FROM your_table
    GROUP BY dealer
) AS t2 ON t1.dealer = t2.dealer AND t1.value = t2.min_value

This solution works by first finding the minimum value for each dealer using MIN() and GROUP BY. It then joins this result with the original table using an INNER JOIN on the dealer column and the min_value column.

Solution 2(Recommended):

SELECT t1.*
FROM your_table t1
LEFT JOIN your_table t2
ON t1.dealer = t2.dealer AND t1.value > t2.value
WHERE t2.value IS NULL

Solution 2 uses a LEFT JOIN to find rows where there are no rows with higher values for the same dealer. Consequently, it produces the rows with the lowest values for each dealer.

Important Note:

Mysql's documentation has a dedicated page for this specific problem: "Rows Holding the Group-wise Maximum/Minimum of a Certain Column". Refer to this page for additional information and alternative approaches.

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