SQL group query maximum value
This question is designed to extract specific data from a table, with the goal of finding the record with the highest "Total" value for each unique "Name" field. This is different from the problem of finding the last record of each group.
Here are two SQL query methods to achieve this goal:
Method 1: Subquery
SELECT Name, Top, Total FROM sometable WHERE Total = ( SELECT MAX(Total) FROM sometable i WHERE i.Name = sometable.Name );
This query uses a subquery to find the maximum Name
value in each Total
group and then selects only the records that match that maximum value.
Method 2: Self-connection
SELECT Name, Top, Total FROM sometable INNER JOIN ( SELECT MAX(Total) AS Total, Name FROM sometable GROUP BY Name ) AS max ON max.Name = sometable.Name AND max.Total = sometable.Total;
This query uses INNER JOIN
to join sometable
with a subquery that calculates the maximum Name
value for each Total
group. The INNER JOIN
condition ensures that only records whose Total
value matches the maximum value for each group are selected.
Both methods give the same result:
Name | Top | Total |
---|---|---|
cat | 3 | 20 |
horse | 4 | 4 |
dog | 6 | 9 |
The above is the detailed content of How to Find the Maximum Total for Each Name Group in SQL?. For more information, please follow other related articles on the PHP Chinese website!

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