CODEWITHSUNDEEP
phpmysqlselectgroup-bymax
Sergiu Z
Sergiu Z

Reputation: 163

Select full row based on MAX value and GROUP BY

Here's the scenario. I have employees and they evaluated yearly for different categories. I need: the full row of the latest evaluation for each category.

Example:

Employee Table:

EmpID  Name
454    John

Evals Table:

id EmpID  Category  EvalDate     Note
1  454       A      2016-01-01   Excellent
2  454       A      2017-02-15   Not so good
3  454       B      2016-01-01   Poor
4  454       B      2017-02-01   Good

I need a query that returns the latest eval (the full row) for each category:

EmpID  Category  EvalDate     Note
454       A      2017-02-15   Not so good
454       B      2017-02-01   Good

My query so far:

SELECT 
    evals.EmpID,
    evals.Category,
    evals.Note,
    MAX(evals.EvalDate) as LatestEval
FROM
    evals
WHERE 
    evals.EmpID = 454
GROUP BY
    evals.Category

This unfortunately returns the latest date for each category but the note field from older evals.

Upvotes: 1

Views: 48

Answers (1)

Sloan Thrasher
Sloan Thrasher

Reputation: 5040

You might give this a try:

SELECT
    evals.EmpID,
    evals.Category,
    evals.Note,
    evals.EvalDate
FROM Employee emp
JOIN Evals evals
ON emp.EmpID = evals.EmpID
AND eval.EvalDate = 
    (SELECT MAX(EvalDate) 
    FROM Evals a 
    WHERE a.Category = evals.category 
        AND a.EmpID = emp.EmpID GROUP BY e.EmpID,e.Category)
GROUP BY evals.EmpID,evals.Category

Upvotes: 2

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