php - Output Growth between Numeric Datafields in database -



php - Output Growth between Numeric Datafields in database -

i output growth percentage between age 20 , age 19. should able "height growth = 3" (by taking height 178 - 175) or there "height growth = .017%" (178/175).

my code looks this

<table> <thead><tr><td>age</td><td>height</td><td>height growth %</td><td>weight</td></tr> </thead> <tbody> <?php foreach ($healthdata->result_array() $row) { echo "<tr><td>".$row['age']."</td><td>".$row['height']."</td><td>%</td> <td>".$row['weight']."</td></tr>"; } ?> </tbody></table>

my model looks this

function display_healthdata() { $healthdata = $this->db->query("select * healthdata id = '1' order age desc;"); homecoming $healthdata; }

essentially don't know kind of sql statement can or code need write able create these calculations. thought may not possible calculation on database or in php , may need on client side instead of server side.

please allow me know other info can/should add together more helpful.

problem solved people finding code helped... code used issue following:

select t1.*, (t1.height - ifnull(t2.height, 0)) growth healthdata t1 left bring together healthdata t2 on (t2.age = (t1.age - 1)) t1.id = '1' grouping age

you can sql joins... i'm tired give proper answer, here's link problem seems similar yours. =d

how difference between 2 rows column field?

edit

i'll take crack @ it. not guaranteed not blow house; stated i'm tired ;)

select t1.*, (t1.height - ifnull(t2.height, 0)) growth healthdata t1 left bring together healthdata t2 on (t2.age = (t1.age - 1))

php sql

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