Question

I have this little script that shows one wisdom each day.

so I have three columns.

Id         wisdom          timestamp
1          wisdon 1        4/1/2012
2          wisdon 2        4/1/2012
3          wisdon 3        4/2/2012

and I want to fetch array of one wisdom for each day

I looked around your website, but unfortunately I didn’t find something similar to what I want.

also I got this code

$sql = mysql_query("SELECT DISTINCT id FROM day_table group by timestamp");

but this also not working.
any ideas?

is it possible to make a counter of 24 hours update wisdom date?
please give me some help.

Answer 1

You can make another table that is called wisdom_of_day

The table would have the following columns, id, wisdom_id, date

Basically each day you can randomly select a wisdom from your wisdom table and insert it into the wisdom day table. You can also add a constraint to your date column so it is distinct. It is important that it is a date column and not a timestamp since you don’t care about time.

Then you can retrieve the wisdom of the day by querying based on the date.

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It’s possible I read your question wrong and you just want to select one wisdom for each day, but you want to show multiple days and you want to get the data from your table.

If so, the reason your query is not working is because you are grouping by a timestamp which includes the date and time. You need to group it by date for it to group like you want.

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Here is a query that will group by the day correctly. This will only work if you have a timestamp field and are not storing a unix timstamp on an int column.

select id, wisdom, date(timestamp) date_only from day_table group by date_only order by date_only asc;

Hmm, I noticed that your timestamp values are in some kind of date format, maybe as a string? If so the above query probably won’t work.