MySQL Group By Like Statement

group bylikeMySQL

I need to get some stats out of our MySQL-DB and wonder if there is a faster way in doing this.

Basically I need info about user registration for any given month before including seperation by attributes.

e.G:

SELECT count(*) AS c  
FROM `users` 
WHERE `date_created` LIKE '2015-10%' 
  AND `country` = 'DE'

This would return a number for October 2015. How could I alter this statement to return results for all months within one statement?

I would also be interested in adding something like AND confirmed = 1 as separate result.

Is this possible with just one MySQL-Statement?

Best Answer

SELECT
   EXTRACT(YEAR FROM date_created) AS yr,   -- for each year
   EXTRACT(MONTH FROM date_created) AS mth, -- & month combination 
   count(*) AS c,                                 -- count all rows 
   SUM(CASE WHEN confirmed = 1 THEN 1 ELSE 0 END) -- count only confirmed rows 
FROM users
WHERE country = 'DE'
GROUP BY yr, mth

Related Solutions

Mysql – execute a prepared statement inside a MySQL SELECT

From the question, it looks like what you have written quasi-resembles what Oracle calls an anonymous code block. MySQL does not facilitate such a mechanism.

With regard to what you want to accomplish, you do not need a stored procedure.

Try assembling the SQL statement like this:

@stmt = 'SELECT sid, ifnull(pricelist,"BASE"), count(*) AS recs FROM buyerList AS b ';
@stmt = CONCAT(@stmt,'LEFT JOIN sellerList AS s ON s.sid = b.sid AND s.pass = b.pass ');
@stmt = CONCAT(@stmt,'LEFT JOIN pricelists p ON ');
SELECT GROUP_CONCAT(CONCAT('(p.sid = a.sid AND p.preisliste = ',sid,' AND p.ean = a.ean AND p.iln = ',pricelist',)') SEPARATOR ' OR ')
INTO @LeftJoinClause FROM preislisten;
@stmt = CONCAT(@stmt,@LeftJoinClause,' WHERE b.bid = ?');
SELECT @stmt\G

This will print out the desired query

If it is the desired query, execute it

PREPARE sql FROM @stmt;
EXECUTE sql using @param_iln;
DEALLOCATE PREPARE sql;

Give it a Try !!!

If you actually want the query to be small without hardcoding every value just write the code with a more straightforward LEFT JOIN setup

SELECT p.sid, ifnull(p.pricelist,"BASE"), count(*) AS recs FROM buyerList AS b
LEFT JOIN sellerList AS s ON s.sid = b.sid AND s.pass = b.pass
LEFT JOIN pricelists p ON
    (p.sid = a.sid AND p.preisliste = a.sid AND p.ean = a.ean)
WHERE b.bid = ?
GROUP BY p.sid,p.pricelist;

I also just noticed you have a.sid and a.ean, what table has an alias of a ?

MySQL – How to GROUP BY Two Different Columns

I don't think I can help you with the formatting, but the query you need is this one:

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