MySQL-按日期选择行并传递给php数组

Question

I have a table with 5 columns which one is date, everytime my event happens at that date, i put a 1 on its column so my tables looks like:

Data;;;;;;;;;;; 0_6 ;;;;;;;;;; 6_12 ;;;;;;;;;; 12_18 ;;;;;;;;;;; 18_24

2013-02-01     ....1.................0...................1......................0 <br>
2013-02-01    ....0.................0...................1......................0 <br>
2013-02-01    ....0.................1...................1......................0 <br>
2013-02-02    ....0.................0...................1......................0 <br>
2013-02-04    ....1.................0...................0......................0 <br>

So what i want to do is to take the sum of all the columns in the day the event occurs and pass it to a php array. i have the start date and end date, i was trying that:
Where $diferenca = difference in days between end and start day

for($i=0; $i < $diferenca;$i++) {
$query = $con->("SELECT Data, sum(0h_6h) AS sum0_6,sum(6h_12h) AS sum6_12,sum(12h_18h) AS sum12_18,sum(18h_24h) AS sum18_24
FROM mytable
WHERE Data = 'Date_format('DATE(data)+$i','%Y-%M-%e')'
ORDER BY Data ASC
LIMIT 1");

while($row = $query->fetch(PDO::FETCH_ASSOC)....
}

but i think i'm having a problem with the mysql query, could someone help me with this select? What where clause should i be using to get my result? thanks in advance!!

Answer 1

Try :

$con->("SELECT 
            Data, 
            sum(0h_6h) AS sum0_6,
            sum(6h_12h) AS sum6_12,
            sum(12h_18h) AS sum12_18,
            sum(18h_24h) AS sum18_24
FROM 
      mytable
WHERE 
      Data BETWEEN start_day AND end_day
GROUP BY 
      Data
ORDER BY
      Data ASC");

change start_day and end_day with acual dates, provided that data is a date type column. If not then change the WHERE clause to suit your needs. What you needed, in my opinion, is the GROUP BY part

Answer 2

And this is not working?

SELECT Data, sum(`0h_6h`) AS sum0_6,
sum(`6h_12h`) AS sum6_12,
sum(`12h_18h`) AS sum12_18,
sum(`18h_24h`) AS sum18_24
FROM mytable
WHERE Data between '2013-02-01' and '2013-02-04' 
/* Date_format('DATE(data)+$i','%Y-%M-%e') */
GROUP BY data
ORDER BY Data ASC
/*LIMIT 1 */

Notice, I have removed LIMIT 1 clause, added two dates in WHERE clause which you can replace with your "start" date and "end date". Added GROUP BY.

If you have 10 days of start date and stop date then your PHP loop will run 10 times which is not a good way to get data out of database. Rather, get all data from server in one shot and then process on client side.

Hope this works for you.