mysql - Check for maximum amount of records in a period -


i've got table "date" column (timestamp). i'm trying achieve check if after inserting row there no more 3 records contained in single 24 hours period, example:

i have records following dates:

1. 2015-05-31 23:14:00 2. 2015-06-01 02:07:00 3. 2015-06-01 15:16:00

so shouldn't able to insert row date of (for example) 2015-06-01 16:01:00 or 2015-06-01 01:01:00 should able add records dates of (for example): 2015-06-01 23:50:00, 2015-05-31 01:05:00.

how can achieve this?

there little trick can achieve problem purely sql

set @date = '2015-05-31 1:14:00';  insert tbldate(inputdate) select @date (     (         select              count(*) c         tbldate t1 inner join tbldate t2                      t1.inputdate <= t2.inputdate ,             t2.inputdate <= t1.inputdate + interval 24 hour ,               t1.inputdate between @date - interval 24 hour , @date         group             t1.inputdate     )      union      (select 0 c) ) r having max(r.c) < 2

where @date date want insert.


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