Question

I have the following data in my database:

|NO | model | date     | 
+---+-------+----------+
|1  | bee   |2011-12-01|
|2  | bee   |2011-12-05|
|3  | bee   |2011-12-12|
|4  | tar   |2011-12-13|

I want to get the latest date of each model group:

| model | date     | 
+-------+----------+
| bee   |2011-12-12|
| tar   |2011-12-13|

I tried:

SELECT model, date 
FROM doc
WHERE date ........????? //what is the next?
GROUP BY model

Answer 1

Are you looking for the max date for each model?

SELECT model, max(date) FROM doc
GROUP BY model

If you’re looking for all models matching the max date of the entire table…

SELECT model, date FROM doc
WHERE date IN (SELECT max(date) FROM doc)

[— Added —]

For those who want to display details from every record matching the latest date within each model group (not summary data, as asked for in the OP):

SELECT d.model, d.date, d.color, d.etc FROM doc d
WHERE d.date IN (SELECT max(d2.date) FROM doc d2 WHERE d2.model=d.model)

MySQL 8.0 and newer supports the OVER clause, producing the same results a bit faster for larger data sets.

SELECT model, date, color, etc FROM (SELECT model, date, color, etc, 
  max(date) OVER (PARTITION BY model) max_date FROM doc) predoc 
WHERE date=max_date;