Mysql – Multi query with group by , join them in different columns

MySQLquery

One table has different columns for each column I want to do a group by function. I get unique values for each column in the table.

Origin Table data:

+----+--------------+--------------+
| id | customername | amazonnumber |
+----+--------------+--------------+
|  1 | Mark         |         1122 |
|  2 | Pieter       |         1122 |
|  3 | Jean         |         1122 |
|  4 | Jean         |         1122 |
|  5 | Janis        |         1123 |
|  6 | Janis        |         1123 |
+----+--------------+--------------+

At this moment i do this:

SELECT customername FROM tablegroup  group by customername; 
SELECT amazonnumber FROM tablegroup  group by amazonnumber;

This is great i get for each column the unique value.

I want to combine them so i get all the data vertical in columns.
I have tried this but, this give not the right results:

SELECT * FROM 
(SELECT customername FROM tablegroup  group by customername) b
 CROSS JOIN
(SELECT amazonnumber FROM tablegroup  group by amazonnumber) c;

This is the wrong result:

+---------------+--------------+
| customername  | amazonnumber |
+---------------+--------------+
| Mark          |        11222 |
| Pieter        |        11222 |
| Jean          |        11222 |
| Janis         |        11222 |
+---------------+--------------+

End Result:

+---------------+--------------+
| customername  | amazonnumber |
+---------------+--------------+
| Mark          |        11222 |
| Pieter        |        11223 |
| Jean          |              |
| Janis         |              |
+---------------+--------------+

Best Answer

For MySQL 8+:

WITH RECURSIVE
cte1 AS ( SELECT customername, ROW_NUMBER() OVER () rn
          FROM tablegroup
          GROUP BY customername 
        ),
cte2 AS ( SELECT amazonnumber, ROW_NUMBER() OVER () rn 
          FROM tablegroup
          GROUP BY amazonnumber 
        ),
cte3 AS ( SELECT 1 num
          UNION ALL
          SELECT num+1 
          FROM cte3
          WHERE num < ( SELECT GREATEST(cnt1, cnt2)
                        FROM ( SELECT COUNT(*) cnt1
                               FROM cte1
                             ),
                             ( SELECT COUNT(*) cnt2
                               FROM cte2
                             )
                      )
        )
SELECT cte1.customername, cte2.amazonnumber
FROM cte3
LEFT JOIN cte1 ON cte3.num = cte1.rn
LEFT JOIN cte2 ON cte3.num = cte2.rn

PROPOSED QUERY

SELECT
    IFNULL(Hour,CONCAT('Total for ',IFNULL(Country,'All Countries'))) Statistic,
    COUNT(1) TotalHits
FROM
(
    SELECT Country,(time - INTERVAL MOD(UNIX_TIMESTAMP(time),3600) SECOND) Hour
    FROM hits WHERE time >= (DATE(NOW()) + INTERVAL 0 SECOND)
) AA
GROUP BY Country,Hour WITH ROLLUP;

YOUR SAMPLE DATA

USE test
DROP TABLE IF EXISTS hits;
CREATE TABLE hits
(
    id int not null auto_increment,
    time datetime,
    country varchar(20),
    PRIMARY KEY (id)
);
INSERT INTO hits (time,Country) VALUES
('2014-06-19 01:00:00','France'),
('2014-06-19 01:00:00','Brazil'),
('2014-06-19 01:00:00','USA'),
('2014-06-19 02:00:00','USA');

YOUR SAMPLE DATA LOADED

mysql> USE test
Database changed
mysql> DROP TABLE IF EXISTS hits;
Query OK, 0 rows affected (0.01 sec)

mysql> CREATE TABLE hits
    -> (
    ->     id int not null auto_increment,
    ->     time datetime,
    ->     country varchar(20),
    ->     PRIMARY KEY (id)
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql> INSERT INTO hits (time,Country) VALUES
    -> ('2014-06-19 01:00:00','France'),
    -> ('2014-06-19 01:00:00','Brazil'),
    -> ('2014-06-19 01:00:00','USA'),
    -> ('2014-06-19 02:00:00','USA');
Query OK, 4 rows affected (0.00 sec)
Records: 4  Duplicates: 0  Warnings: 0

mysql> SELECT * FROM hits;
+----+---------------------+---------+
| id | time                | country |
+----+---------------------+---------+
|  1 | 2014-06-19 01:00:00 | France  |
|  2 | 2014-06-19 01:00:00 | Brazil  |
|  3 | 2014-06-19 01:00:00 | USA     |
|  4 | 2014-06-19 02:00:00 | USA     |
+----+---------------------+---------+
4 rows in set (0.00 sec)

mysql>

PROPOSED QUERY EXECUTED

mysql> SELECT
    ->     IFNULL(Hour,CONCAT('Total for ',IFNULL(Country,'All Countries'))) Statistic,
    ->     COUNT(1) TotalHits
    -> FROM
    -> (
    ->     SELECT Country,(time - INTERVAL MOD(UNIX_TIMESTAMP(time),3600) SECOND) Hour
    ->     FROM hits WHERE time >= (DATE(NOW()) + INTERVAL 0 SECOND)
    -> ) AA
    -> GROUP BY Country,Hour WITH ROLLUP;
+-------------------------+-----------+
| Statistic               | TotalHits |
+-------------------------+-----------+
| 2014-06-19 01:00:00     |         1 |
| Total for Brazil        |         1 |
| 2014-06-19 01:00:00     |         1 |
| Total for France        |         1 |
| 2014-06-19 01:00:00     |         1 |
| 2014-06-19 02:00:00     |         1 |
| Total for USA           |         2 |
| Total for All Countries |         4 |
+-------------------------+-----------+
8 rows in set (0.00 sec)

mysql>

I'll leave the formatting to you :-)

CAVEAT: Please make sure you have a time index on the table

ALTER TABLE hits ADD INDEX time_index (time);

An additional query could be

SELECT
    IFNULL(Country,CONCAT('Total for ',IFNULL(Hour,DATE(NOW())))) Statistic,
    COUNT(1) TotalHits
FROM
(
    SELECT Country,(time - INTERVAL MOD(UNIX_TIMESTAMP(time),3600) SECOND) Hour
    FROM hits WHERE time >= (DATE(NOW()) + INTERVAL 0 SECOND)
) AA
GROUP BY Hour,Country WITH ROLLUP;

whose output would be

+-------------------------------+-----------+
| Statistic                     | TotalHits |
+-------------------------------+-----------+
| Brazil                        |         1 |
| France                        |         1 |
| USA                           |         1 |
| Total for 2014-06-19 01:00:00 |         3 |
| USA                           |         1 |
| Total for 2014-06-19 02:00:00 |         1 |
| Total for 2014-06-19          |         4 |
+-------------------------------+-----------+
7 rows in set (0.00 sec)

UPDATE 2014-06-21 19:07 EDT

Perhaps the the two queries combined with UNION will work for you

SELECT
    IFNULL(Country,CONCAT('Total for ',IFNULL(Hour,DATE(NOW())))) Statistic,
    COUNT(1) TotalHits
FROM
(
    SELECT Country,(time - INTERVAL MOD(UNIX_TIMESTAMP(time),3600) SECOND) Hour
    FROM hits WHERE time >= (DATE(NOW()) + INTERVAL 0 SECOND)
) AA
GROUP BY Hour,Country
UNION
SELECT
    IFNULL(Hour,CONCAT('Total for ',IFNULL(Country,'All Countries'))) Statistic,
    COUNT(1) TotalHits
FROM
(
    SELECT Country,(time - INTERVAL MOD(UNIX_TIMESTAMP(time),3600) SECOND) Hour
    FROM hits WHERE time >= (DATE(NOW()) + INTERVAL 0 SECOND)
) AA
GROUP BY Country,Hour WITH ROLLUP;

I removed the WITH ROLLUP from the first one so that the total comes out once

Best Answer

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