MySQL获取具有时间间隔的行

Question

I have a table with some columns where one column has timestamp where data is created. Suppose following is a table.

id | val | time
---+-----+--------------------
1  |  1  |2016-07-02 03:31:31
1  |  2  |2016-07-02 03:32:32
1  |  2  |2016-07-02 03:33:33
1  |  3  |2016-07-02 03:33:34
1  |  4  |2016-07-02 03:41:31
1  |  5  |2016-07-02 03:41:32
1  |  5  |2016-07-02 03:46:33
1  |  6  |2016-07-02 03:47:34

On an average of every one second, one entry goes to that table. This is too much data to show on UI. I want data to be consolidated for every 10 minutes.

ie only two row should come as result. The value of column val can be anything, it is ok if the val is any one of them or the average of them.

Desired output (any of three)

id | val | time
---+-----+--------------------
1  |  1  |2016-07-02 03:3X:XX
1  |  4  |2016-07-02 03:4X:XX

OR

id | val | time
---+-----+--------------------
1  |  2  |2016-07-02 03:3X:XX
1  |  5  |2016-07-02 03:4X:XX

OR

id | val | time
---+-----+--------------------
1  |  3  |2016-07-02 03:3X:XX
1  |  6  |2016-07-02 03:4X:XX

Is there a way to make that 10 minutes as dynamic parameters? (static is ok for start)

EDIT Including my comment here: I am using hibernate, so preference is hibernate. But if that does not work then we only have option with MySQL native. There is no criteria of last X rows, I want all the rows for particular id and between particular date. It's just that i want less rows with 10 mins of interval.

Answer 1

Following query will give your expected result.

MySQL syntax

DROP TABLE TEMP_TEST;
CREATE TABLE TEMP_TEST(ID INT,VAL INT,TIME DATETIME);

INSERT INTO TEMP_TEST VALUES
(1,1,'2016-07-02 03:31:31'),
(1,2,'2016-07-02 03:32:32'),
(1,2,'2016-07-02 03:33:33'),
(1,3,'2016-07-02 03:33:34'),
(1,4,'2016-07-02 03:41:31'),
(1,5,'2016-07-02 03:41:32'),
(1,5,'2016-07-02 03:46:33'),
(1,6,'2016-07-02 03:47:34'),
(1,6,'2016-07-02 03:51:34');


SELECT @INTERVAL := 10, @PREVIOUS_TIME := (select time from TEMP_TEST LIMIT  1);
SELECT TIME,
@INTERVAL ,
@PREVIOUS_TIME,
TIMESTAMPDIFF(MINUTE,@PREVIOUS_TIME,TIME) AS DIFF_INTERVAL,
  (CASE
    WHEN ((TIMESTAMPDIFF(MINUTE,@PREVIOUS_TIME,TEMP_TEST.TIME))%@INTERVAL)=0 THEN "TRUE"
    ELSE "FALSE"
  END) AS VALID
from TEMP_TEST;

SQL Server syntax

DROP TABLE #TEMP_TEST;
CREATE TABLE #TEMP_TEST(ID INT,VAL INT,TIME DATETIME)

INSERT INTO #TEMP_TEST VALUES
(1,1,'2016-07-02 03:31:31'),
(1,2,'2016-07-02 03:32:32'),
(1,2,'2016-07-02 03:33:33'),
(1,3,'2016-07-02 03:33:34'),
(1,4,'2016-07-02 03:41:31'),
(1,5,'2016-07-02 03:41:32'),
(1,5,'2016-07-02 03:46:33'),
(1,6,'2016-07-02 03:47:34'),
(1,6,'2016-07-02 03:51:34');


DECLARE @INTERVAL INT=10;
DECLARE @PREVIOUS_TIME DATETIME;
SELECT TOP 1 @PREVIOUS_TIME=TIME FROM #TEMP_TEST ORDER BY TIME

SELECT TIME,
@INTERVAL AS INTERVAL ,
@PREVIOUS_TIME AS PREVIOUS_TIME, 
DATEDIFF(MINUTE,@PREVIOUS_TIME,TIME) AS DIFF_INTERVAL,
CASE WHEN (((DATEDIFF(MINUTE,@PREVIOUS_TIME,TIME))%@INTERVAL)=0) THEN 'TRUE' ELSE 'FALSE' END AS TRUE
FROM #TEMP_TEST
WHERE (CASE WHEN (((DATEDIFF(MINUTE,@PREVIOUS_TIME,TIME))%@INTERVAL)=0) THEN 'TRUE' ELSE 'FALSE' END)='TRUE'
ORDER BY TIME

EDIT : Updated MySQL Syntax of query.