Php number array from max, min, step size mysql data
I want to create a form with data values in a dropdown list. The values in the dropdown list need to be generated on the fly from max, min and increment values contained in a mysql database.
Hopefully this makes sense, I really have no idea where to start
Thanks
Can you explain a little more about how to get the increment value? How is it stored in the MySQL table?
For the minimum and maximum value you would normally perform something like this:
and wrap that around PHP code, which is not provided here, because it is the next step.
So the Min, Max and increment are all stored in the mysql table as integers, what I need to do is to great the array of values that will populate for the dropdown list. ie if Max=6, Min=0, increment=2 then I need the query to produce 0, 2, 4, 6
There are countless examples of that on the internet, for example here: PHP Select Data From MySQL
From the first example on that page you would change this part:
...what I need to do is to great the array of values that will populate for the dropdown list. ie if Max=6, Min=0, increment=2 then I need the query to produce 0, 2, 4, 6
Just a quick note here - MySQL does not have features that would make creating such a query easy. It does not support recursive "with" subqueries (also called CTEs - Common Table Expressions). It does not support hierarchical queries. It does not provide pipelined functions or functions to generate a series of numbers.
Given all these limitations, your best bet for a database query would be to pre-populate a table of integers and use it to return the number series you want. And then again, there is the problem of how many rows the table should contain, if its load is static.
The hassle-free alternative is to fetch those three values (min, max, increment) in PHP and generate the numbers in there. I do not know PHP, but by looking at the "for" loops the others have posted here, it doesn't look that complicated.
---------- Post updated at 11:23 PM ---------- Previous update was at 10:52 PM ----------
Nevertheless, the approach mentioned above for the database query is posted here. Let's say you **know** beforehand that the min value will never be below 0 and the max value will never be above 10. Then you can populate an "iterator" table (called "numbers" in the example below) with values from 0 to 10.
The rest should be easy to comprehend:
The limitation of this method should be easy to see. If you update the max value in the dropdown table to 1000, then the final query will return incorrect result unless you load numbers at least till 1000 in the iterator table.
Hi to all,
Please help on the following problem, I'm not where to begin, if awk or shell script.
I have pairs of ranges of numbers and I need to find the root or roots of ranges based on min Range and Max ranges
Example #1:
If min range is 120000 and max ranges 124999, it means that are... (5 Replies)
Gents,
I have a big file file like this.
5100010002
5100010004
5100010006
5100010008
5100010010
5100010012
5102010002
5102010004
5102010006
5102010008
5102010010
5102010012
The file is sorted and I would like to find the min and max value, taking in the consideration key1... (3 Replies)
I need to use awk for this task !
input (fields are separated by ";"):
1%2%3%4%;AA
5%6%7%8%9;AA
1%2%3%4%5%6;BB
7%8%9%10%11%12;BBIn the 1st field there are patterns composed of numbers separated by "%".
The 2nd field define groups (here two different groups called "AA" and "BB").
Records... (8 Replies)
Hi all,
I have a list of numbers. I need an awk command to find out the numbers of elements (number of numbers, sort to speak), the average value the min and max value. Reading the list only once, with awk.
Any ideas?
Thanks! (5 Replies)
Hello Experts,
I have got a txt files which has multiple columns, I want to get the max, min and diff (max-min) for each column in the same txt file. Example:
cat file.txt
a 1 4
b 2 5
c 3 6
I want ouput like:
cat file.txt
a 1 4
b 2 5
c 3 6
Max 3 6
Min 1 4
Diff 2 2
awk 'min=="" ||... (4 Replies)
Hi,
I have a text file containing numbers. There are up to 6 numbers per row and I need to read them, check if they are 0 and if they are not zero check if they are within a given interval (min,max). If they exceed the max or min they should be set to max or min respectively, if they are in the... (4 Replies)
hi!
i have a file like the attachement.
I'd like to get for each line the min, max and average values. (there is 255 values for each line)
how can i get that ?
i try this, is it right?
BEGIN {FS = ","; OFS = ";";max=0;min=0;moy=0;total=0;freq=890}
$0 !~ /Trace1:/ {
... (1 Reply)
I'm trying to iterate a UNIX awk script that returns min/max temperature data for each day from a monthly weather data file (01_weath.dat). The temperature data is held in $5. The temps are reported each minute so each day contains 1440 temperature enteries. The below code has gotten me as far as... (5 Replies)