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Asked: 2026-05-11T07:31:36+00:00

I want to get the number of Registrations back from a time period (say

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I want to get the number of Registrations back from a time period (say a week), which isn’t that hard to do, but I was wondering if it is in anyway possible to in MySQL to return a zero for days that have no registrations.

An example: DATA:

 ID_Profile    datCreate 1   2009-02-25 16:45:58 2   2009-02-25 16:45:58 3   2009-02-25 16:45:58 4   2009-02-26 10:23:39 5   2009-02-27 15:07:56 6   2009-03-05 11:57:30

SQL:

     SELECT          DAY(datCreate) as RegistrationDate,      COUNT(ID_Profile) as NumberOfRegistrations      FROM tbl_profile     WHERE DATE(datCreate) > DATE_SUB(CURDATE(),INTERVAL 9 DAY)     GROUP BY RegistrationDate     ORDER BY datCreate ASC;

In this case the result would be:

 RegistrationDate    NumberOfRegistrations 25  3 26  1 27  1 5   1

Obviously I’m missing a couple of days in between. Currently I’m solving this in my php code, but I was wondering if MySQL has any way to automatically return 0 for the missing days/rows. This would be the desired result:

 RegistrationDate    NumberOfRegistrations 25  3 26  1 27  1 28      0 1       0 2       0 3       0 4       0 5   1

This way we can use MySQL to solve any problems concerning the number of days in a month instead of relying on php code to calculate for each month how many days there are, since MySQL has this functionality build in.

Thanks in advance

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1 Answer

  1. No, but one workaround would be to create a single-column table with a date primary key, preloaded with dates for each day. You’d have dates from your earliest starting point right through to some far off future.

    Now, you can LEFT JOIN your statistical data against it – then you’ll get nulls for those days with no data. If you really want a zero rather than null, use IFNULL(colname, 0)

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