问题
after reading through a couple similar Qs/As I haven't quite found the solution I'm looking for. The table data I have is GROUP BY DATE(timestamp) and returning a count, example result:
[timestamp] => 2010-05-12 20:18:36
[count] => 10
[timestamp] => 2010-05-14 10:10:10
[count] => 8
Without using a temporary table, or calendar table is there a way to fill in those missing dates? so that with the same table data would return:
[timestamp] => 2010-05-12 20:18:36
[count] => 10
/**
* I would like to have this row added:
*/
[timestamp] => 2010-05-13 00:00:00
[count] => 0
[timestamp] => 2010-05-14 10:10:10
[count] => 8
Thanks!
回答1:
The best way to solve this is to find the missing results on the client side and add them when you present the results.
回答2:
I didn't find the exact solution i was looking for, but I think found a method that works enough for my needs. I created a traffic table where the first visitor of the day will trigger a row insert for the day and now I can join on this table to get a daily record of whatever. The only problem however, is if there is no traffic for a day that date won't exist in the table. This can be solved by running a daily cron to insert a new row.
回答3:
You should create a tally table (only 1 column: date), and fill it beforehand. You can run a cron script to fill 1 year, and run it once a year.
来源：https://stackoverflow.com/questions/2844486/mysql-to-fill-in-missing-dates-when-using-group-by-datetable-timestamp-without