sql - SUM Two Different Columns in two different tables Grouped by Column in third table -

-

i can work in 2 seperate queries can't both joins have 3 columns. can me out please? need output this:

+------------------------------------------------+ | cluster_name   | total_units   |allocated_units| +------------------------------------------------+ |    cluster1    | 300           |25             | +------------------------------------------------+ |    cluster2    | 400           |45             | +------------------------------------------- ----+

two seperate queries working:

query 1:

select     cluster_info.cluster_name, sum(host_info.unit_count) 'total_units'         cluster_info inner join  host_info on host_info.cluster_id = cluster_info.cluster_id group cluster_info.cluster_name

query 2:

select     cluster_info.cluster_name, sum(vm_info.unit_count) 'allocated_units'         cluster_info inner join  vm_info on cluster_info.cluster_id = vm_info.cluster_id group cluster_info.cluster_name

table 1 (cluster_info):

+--------------------------------+ | cluster_name   | cluster_id    | +--------------------------------+ |    cluster1    | 1             | +--------------------------------+ |    cluster2    | 2             | +--------------------------------+

table 2 (host_info):

+------------------------------------------------+ | host_name      | cluster_id    | unit_count    | +------------------------------------------------+ |    host1       | 1             | 150           | +------------------------------------------------+ |    host2       | 1             | 150           | +------------------------------------------------+ |    host3       | 2             | 200           | +------------------------------------------------+ |    host4       | 2             | 200           | +------------------------------------------------+

table 3 (vm_info):

+------------------------------------------------+ | vm_name        | cluster_id    | unit_count    | +------------------------------------------------+ |    vm1         | 1             | 10            | +------------------------------------------------+ |    vm2         | 1             | 15            | +------------------------------------------------+ |    vm3         | 2             | 20            | +------------------------------------------------+ |    vm4         | 2             | 25            | +------------------------------------------------+

http://www.sqlfiddle.com/#!2/5f9614/5

it safest using 2 subqueries:

select ci.cluster_name, hi.total_units, vi.allocated_units cluster_info ci left join       (select hi.cluster_id, sum(hi.unit_count) total_units       host_info hi       group hi.cluster_id      ) hi      on ci.cluster_id = hi.cluster_id left join      (select vi.cluster_id, sum(vi.unit_count) allocated_units       vm_info vi       group vi.cluster_id      ) vi      on ci.cluster_id = vi.cluster_id ;

i introduced table aliases make query more readable. and, don't put column aliases in single quotes. don't need quote these names @ all. use single quotes date , string constants.

this sql fiddle shows working.


Comments

Post a Comment

Popular posts from this blog

c++ - OpenCV Error: Assertion failed <scn == 3 ::scn == 4> in unknown function, -

-
i read alot other solution still confused should mine... #include <opencv2/objdetect/objdetect.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <iostream> #include <stdio.h> using namespace std; using namespace cv; int main(int argc, const char** argv) { //create cascade classifier object used face detection cascadeclassifier face_cascade; //use haarcascade_frontalface_alt.xml library face_cascade.load("haarcascade_frontalface_alt.xml"); //setup video capture device , link first capture device videocapture capturedevice; capturedevice.open(0); //setup image files used in capture process mat captureframe; mat grayscaleframe; //create window present results namedwindow("outputcapture", 1); //create loop capture , find faces while (true) { //capture new image frame capturedevice >> captureframe; ...
Read more

php - render data via PDO::FETCH_FUNC vs loop -

-
i've been using 2 methods render data. the first one: function name($id,$name){ return '<div id="'.$id.'">'.$name.'</div>'; } echo implode($pdo->query("select id,name user")->fetchall(pdo::fetch_func,'name')); the second one: $users = $pdo->query("select id,name user")->fetchall(pdo::fetch_obj); foreach($users $user){ echo name($user->id,$user->name); } i don't understand how pdo::fetch_func works. tried figure out. however, not well-documented. could please explain fetch mode? , also, 1 performs better? thank you. both methods wrong , have learn how use templates , how separate business logic presentation logic. $users = $pdo->query("select id,name user")->fetchall(pdo::fetch_obj); tpl::assign('users', $users); is code business logic part. then in template <?php foreach $users $row): ?> <div id="<?=$...
Read more

The canvas has been tainted by cross-origin data in chrome only -

-
uncaught securityerror: failed execute 'getimagedata' on 'canvasrenderingcontext2d': canvas has been tainted cross-origin data i getting above error in chrome. code(following) works fine in mozilla. have not corss domain issue. why above error in chrome? var wheel_canvas, wheel_context, can_w, can_h, wheel_grd; var large_radius = 160; var small_radius = 120; var wheel_canvas = document.getelementbyid('wheel_canvas'); var wheel_context = wheel_canvas.getcontext('2d'); var can_w = $(wheel_canvas).width(); var can_h = $(wheel_canvas).height(); var centerx = can_w / 2, centery = can_h / 2; var wheel_grd = null; test('#ff0000'); function test(hex) { $('#clrpicker').css({'left': 210, 'top': 210 }); inverted = hexbw(hex); $('#color_val_show').val(hex); current_color_hex_val_selected = hex; $('#color_val_show').css({'color':inverted,'background':hex}); fillgradient...
Read more