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Editorial Team
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Asked: 2026-05-24T02:03:16+00:00

I have an html form (each form has different page, according to date), with

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I have an html form (each form has different page, according to date), with five text inputs, called date, inp1, inp2, inp3 and inp4.

For example, I have database table, with structure like this: id | parent | name | value.
In this case, I want to store my data, and adding it to date by parent, like this:

id | parent | name | value
1  | 0      | date | 20.07.2011
2  | 1      | inp1 | value-from-inp1
3  | 1      | inp2 | value-from-inp2
4  | 0      | date | 21.07.2011
5  | 4      | inp2 | value-from-inp2
6  | 1      | inp3 | value-from-inp3
7  | 4      | inp1 | value-from-inp1

and so on…

But problem starts here. I want to create option, that you can update those values for previously added.
But the QUESTIONS are, how to check, if

  1. Do I have anything assigned to that date already?
    1. If is assigned, how to determine, and use MySQL Update for that
    2. If is not assigned, how to determine, and use MySQL Insert Into for that

My stupid and 50% more inefficient of loading page solution for this problem sounds like this (Don’t worry about security, its just mock-up):

if($_POST['submit']){
$inp1_data = $db->get_row("SELECT name FROM table WHERE parent = ".$parent_id." and name='inp1'");
if($inp1_data){$db->update($query)}else{$db->insert($query)}

// ... and so on, four copies of same code, just replacing "inp1" to "inp2", "inp3"...
}

Yes, I know, this is useless script, in case, if I have added one more, or hundreds of inpNUMBER, it would be crush test site, 100% guaranteed timeout, not working script.

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1 Answer

  1. Editorial Team

    It sounds to me like you’re trying to use a singe table where you really need two. To answer your question, because the date is stored separately from the value, there is no way to find out if you have a value assigned to a particular question using a single SELECT. You may be able to do this with a nested select, but I won’t try to go through the contortions to make it happen.

    Consider this alternative design, which assumes that a given field can’t be repeated for a given submission:

    Submission table

    submission_id | date
1             | 20.07.2011
2             | 21.07.2011

    answers table

    submission_id | field_name | field_value
1             | inp1       | value-from-inp1
1             | inp2       | value-from-inp2
2             | inp2       | value-from-inp2
2             | inp4       | value-from-inp4
1             | inp3       | value-from-inp3

    Note that Randolf Rincón-Fadul’s suggestion of keeping the data types separated by field is a good one, but I haven’t done it here to keep things simple. Now you can find out if you have an answer for a particular date by joining the tables.

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