Question

I’ve been wrestling with this for a while now. I’m not sure MYSQL query is the best way to do this but I’m at a loss.

I have entries for certain people on certain dates, however they won’t always be on the same date. Eg:

Person     Date        Product
Mike     2012/12/1      Pants
Chris    2012/12/4      Shoes
Mike     2012/12/4      Pants
Julian   2012/12/5      Hat

I am using this table for trending reports and I need to select a date range, example 2012/12/2 – 2012/12/10. I need a table that shows what each person was wearing each day so I can see what percentage is being worn on any given day. The output table would look something like this:

Person     Date        Product
Mike     2012/12/1      Pants
Mike     2012/12/2      Pants
Mike     2012/12/3      Pants
Chris    2012/12/4      Shoes
Mike     2012/12/4      Shoes
Julian   2012/12/5      Hat
Mike     2012/12/5      Shoes
Chris    2012/12/5      Shoes
Julian   2012/12/6      Hat
Mike     2012/12/6      Shoes
Chris    2012/12/6      Shoes
Julian   2012/12/7      Hat
Mike     2012/12/7      Shoes
Chris    2012/12/7      Shoes

And so forth…. depending on the date range. Ideally a table like this would be even better:

  Date         Product   Worn    Total
2012/12/1      Pants      1        1
2012/12/1      Shoes      0        1
2012/12/1      Hat        0        1
2012/12/2      Pants      1        1
2012/12/2      Shoes      0        1
2012/12/2      Hat        0        1
2012/12/3      Pants      1        1
2012/12/3      Shoes      0        1
2012/12/3      Hat        0        1
2012/12/4      Pants      0        2
2012/12/4      Shoes      2        2
2012/12/4      Hat        0        2
2012/12/4      Pants      0        3
2012/12/4      Shoes      2        3
2012/12/4      Hat        1        3

I’m currently working in PHP using a MySql DB. Any thoughts, suggestions are appreciated.

Answer 1

pseudocode mostly:

for(EACH day in date range){
 $query = SELECT COUNT(product) from table WHERE date="day" AND product = "hat";
 $getResults=mysql_query($query) or die(mysql_error());
 while($row = mysql_fetch_array($getResults))
 {
  $inventory_count = $row['COUNT(product)'];

 }
 echo 'Date'. $date.' - 'Product: hat - total = '. $inventory_count;
 $query = SELECT COUNT(product) from table WHERE date="day" AND product = "pants";

 $getResults=mysql_query($query) or die(mysql_error());
 while($row = mysql_fetch_array($getResults))
 {
  $inventory_count = $row['COUNT(product)'];

 }
  echo 'Date'. $date.' - 'Product: pants' - 'total = '. $inventory_count;
 $query = SELECT COUNT(product) from table WHERE date="day" AND product = "shoes";

 $getResults=mysql_query($query) or die(mysql_error());
 while($row = mysql_fetch_array($getResults))
 {
  $inventory_count = $row['COUNT(product)'];

 } 
 echo 'Date'. $date.' - 'Product: shoes' - 'total = '. $inventory_count;
}

It’s probably not the most efficient way to get it but it should get you the data you need. Put in some TR’s and TD’s, wrap it in a table and you should have what you are looking for.