MySQL concat column in date_format - mysql

Question

I have this table: table1, and four varaible $START_MONTH $START_YEAR $END_MONTH $END_YEAR which return: month:1, year: 2014 and 3, 2015
+----+-----+-------+------+-------------+
| ID | DAY | MONTH | YEAR | DESCRIPTION |
+----+-----+-------+------+-------------+
| 1 | 1 | 1 | 2014 | Product 1 |
| 2 | 1 | 2 | 2015 | Product 2 |
| 3 | 2 | 3 | 2014 | Product 1 |
| 4 | 10 | 1 | 2015 | Product 3 |
| 5 | 9 | 5 | 2015 | Product 3 |
+----+-----+-------+------+-------------+
SELECT
DATE_FORMAT (CONCAT (DAY,' ', MONTH,' ',YAR), GET_FORMAT(DATE,'EUR')) AS NEW_DATA,
DESCRIPTION
FROM table1
WHERE
NEW_DATA BETWEEN $START_MONTH . $START_YEAR AND $END_MONTH . $END_YEAR
I need return the rows included between: 1.2014 and 3.2015. Thank you!

Answer 1

In MySQL you can filter by combined columns:
SELECT *
FROM table1
WHERE (`YEAR`, `MONTH`) >= (2014,1)
AND (`YEAR`, `MONTH`) <= (2015,3)
http://sqlfiddle.com/#!9/87000/2
Update: As Strawberry stated, MySQL will not use an index for this condition. But it's not that it's impossible - MySQL is just missing this optimisation. As far as i know PostgreSQL is fine with this kind of index range check. So we can hope that MySQL/MariaDB will support it in the future.
However, if you face performance problems, you can add redundant conditions for the year range:
WHERE (`YEAR`, `MONTH`) >= (2014,1)
AND (`YEAR`, `MONTH`) <= (2015,3)
AND `YEAR` >= 2014
AND `YEAR` <= 2015
This way MySQL will first filter the rows by YEAR using an index like YEAR, MONTH or YEAR, MONTH, DAY (or any index that starts with YEAR).
All alternatives i know are not very readable and no of them can use an index:
WHERE DATE(CONCAT_WS('-', `YEAR`, `MONTH`, 1)) >= '2014-01-01'
AND DATE(CONCAT_WS('-', `YEAR`, `MONTH`, 1)) <= '2015-03-01'
Or
WHERE (`YEAR` = 2014 AND `MONTH` >= 1)
OR (`YEAR` = 2015 AND `MONTH` >= 3)
OR (`YEAR` > 2014 AND `YEAR` < 2015)
If you are fighting for every milisecond you can also create an indexed generated (virtual) column (MySQL 5.7):
`DATE` AS STR_TO_DATE(CONCAT_WS('-', `YEAR`, `MONTH`, `DAY`),'%Y-%m-%d') VIRTUAL KEY
And query like:
WHERE `DATE` >= '2014-01-01'
AND `DATE` < '2015-04-01'

Answer 2

SELECT
DATE_FORMAT (CONCAT (DAY,' ', MONTH,' ',YEAR), GET_FORMAT(DATE,'EUR')) AS NEW_DATA,
DESCRIPTION
FROM table1
WHERE
(YEAR BETWEEN $START_YEAR AND $END_YEAR)
AND (MONTH BETWEEN $START_MONTH AND $END_MONTH)