MySQL groupby with sum -


i have query group , sum. have close 1 million records. when run query taking 2.5s. if remove group clause taking 0.89s. there way can optimize query using group , sum together.

 select aggei.ei_uuid uuid,aggei.companydm_id companyid,aggei.rating       rating,aggei.ei_name name,  compdm.company_name companyname,sum(aggei.count) activity       agg_externalindividual aggei       join companydm compdm on aggei.companydm_id = compdm.companydm_id       aggei.ei_uuid not null         , aggei.companydm_id in (8)         , aggei.datedm_id = 20130506          , aggei.topicgroupdm_id in (1,2,3,4,5,6,7)         , aggei.rating >= 0         , aggei.rating <= 100  group aggei.ei_uuid,aggei.companydm_id limit 0,200000

explain result below:

  1 simple  compdm  const   primary,companydm_id_unique,comp_idx    primary 8       const   1   using temporary; using filesort   1 simple  aggei   ref       primary,datedm_id_unique,agg_ei_comdm_fk_idx,agg_ei_datedm_fk_idx,agg_ei_topgrp_fk_idx,uid_comp_ei_dt_idx,uid_comp_dt_idx,comp_idx    datedm_id_unique    4   const   197865  using

also didn't understand why compdm table executed first. can explain?

i have index on agg_externalindividual table combination of ei_uuid,companydm_id,datedm_id. same shown on aggei table under possible keys uid_comp_dt_idx. aggei table taking datedmid_unique key. didn't understand behavior.

can explain?

explain has run dependent queries before can run main one.

you need check indexing on agg_externalindividual.


Comments

Post a Comment

Popular posts from this blog

c# - DetailsView in ASP.Net - How to add another column on the side/add a control in each row? -

i have detailsview control on page used edit various fields of record, works in respect. i looking way add 1 column (and if works, why not more) right, absolutely read-only, show same fields of record comparison purposes. i aware there no obvious way such thing out of box detailsview . have looked other controls (transposed gridview , recommended formview , listview ), nothing satisfies. have special data binding setup using detailsview , can't out of without losing features. anyone on how "hack in" additional columns (for display only) on detailsview ? the solution have now, use second detailsview , visible set false in aspx. in code, make sure databind hidden detailsview hosts data third column first, initial detailsview named itemdetails . and in item created event, pass third column html rendering of hidden controls (in last code block) : protected void itemdetails_itemcreated(object sender, eventargs e) { if (dataite
Read more

javascript - firefox memory leak -

i have following script (i use raphaeljs also) draws circle, waits 1 second, draws circle again, etc (you can copy paste - functional, need include raphael raphaeljs.com): <div id="holder"> </div> <script src="raphael.js" type="text/javascript"></script> <script> var paper = raphael(10, 50, 320, 200); var rad = math.pi / 180; var finangle = 0; function sector(cx, cy, r, startangle, endangle, params) { var x1 = cx + r * math.cos(-startangle * rad), x2 = cx + r * math.cos(-endangle * rad), y1 = cy + r * math.sin(-startangle * rad), y2 = cy + r * math.sin(-endangle * rad); return ["m", cx, cy, "l", x1, y1, "a", r, r, 0, +(endangle - startangle > 180), 0, x2, y2]; } var path = sector(100,100,50,0,180); var arc = paper.path(path); function draw() { path = sector(100,100,50,0,finangle);
Read more

Trying to import CSV file to a SQL Server database using asp.net and c# - can't find what I'm missing -

i student , quite new programming, , given task using asp.net , c#, without being taught either. plan learn teach ourselves. the task stuck on making website import csv file sql server database of last year's room bookings around campus. the table has following columns: request_id; priority; module_id; day; start_time; length; park; students; room_code; status; semester_id; linked_request; week_1; week_2; week_3; week_4; week_5; week_6; week_7; week_8; week_9; week_10; week_11; week_12; week_13; week_14; week_15; ) in code, try make work 3 columns (request_id,priority,module) starters. when press import button, want read .csv file (with fixed name @ fixed directory) eg "1,2,3" - comma separating fields [delimiter] - , import sql server datab
Read more