CODEWITHSUNDEEP
mysqlsqlselectdateadd
BMN
BMN

Reputation: 8508

MySQL - DATE_ADD month interval

I face a problem with the function DATE_ADD in MySQL.

My request looks like this :

SELECT * 
FROM mydb 
WHERE creationdate BETWEEN "2011-01-01" AND DATE_ADD("2011-01-01", INTERVAL 6 MONTH) 
GROUP BY MONTH(creationdate)

The problem is that, in the results, -I think- because June has only 30 days, the function doesn't work properly as I have the results of the first of July.

Is there a way to tell DATE_ADD to work well and take the right number of days within a month?

Upvotes: 35

Views: 127494

Answers (5)

Adriano Carneiro
Adriano Carneiro

Reputation: 58595

DATE_ADD works just fine with different months. The problem is that you are adding six months to 2001-01-01 and July 1st is supposed to be there.

This is what you want to do:

SELECT * 
FROM mydb 
WHERE creationdate BETWEEN "2011-01-01" 
                   AND DATE_ADD("2011-01-01", INTERVAL 6 MONTH) - INTERVAL 1 DAY
GROUP BY MONTH(creationdate)

OR

SELECT * 
FROM mydb 
WHERE creationdate >= "2011-01-01" 
AND creationdate < DATE_ADD("2011-01-01", INTERVAL 6 MONTH)
GROUP BY MONTH(creationdate)

For further learning, take a look at DATE_ADD documentation.

*edited to correct syntax

Upvotes: 69

sw0x2A
sw0x2A

Reputation: 308

Do I understand right that you assume that DATE_ADD("2011-01-01", INTERVAL 6 MONTH) should give you '2011-06-30' instead of '2011-07-01'? Of course, 2011-01-01 + 6 months is 2011-07-01. You want something like DATE_SUB(DATE_ADD("2011-01-01", INTERVAL 6 MONTH), INTERVAL 1 DAY).

Upvotes: 1

Jacob
Jacob

Reputation: 43209

BETWEEN ... AND

If expr is greater than or equal to min and expr is less than or equal to max, BETWEEN returns 1, otherwise it returns 0.

The important part here is EQUAL to max., which 1st of July is.

Upvotes: 1

yu_sha
yu_sha

Reputation: 4410

DATE_ADD works correctly. 1 January plus 6 months is 1 July, just like 1 January plus 1 month is 1 of February.

Between operation is inclusive. So, you are getting everything up to, and including, 1 July. (see also MySQL "between" clause not inclusive?)

What you need to do is subtract 1 day or use < operator instead of between.

Upvotes: 0

wonk0
wonk0

Reputation: 13952

Well, for me this is the expected result; adding six months to Jan. 1st July. 

mysql> SELECT DATE_ADD( '2011-01-01', INTERVAL 6 month );
+--------------------------------------------+
| DATE_ADD( '2011-01-01', INTERVAL 6 month ) |
+--------------------------------------------+
| 2011-07-01                                 | 
+--------------------------------------------+

Upvotes: 6

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