sql server - Subtracting values based on date SQL -


i have data looks many more index names , index values

dt                     indx_nm      indx_val 2013-08-13 00:00:00.000 abqi        1571.93 2013-08-12 00:00:00.000 abqi        1568.55 2013-08-09 00:00:00.000 abqi        1566.1 2013-08-08 00:00:00.000 abqi        1573.98 2013-08-07 00:00:00.000 abqi        1567.42 2013-08-06 00:00:00.000 abqi        1579.49 2013-08-13 00:00:00.000 acnactr     280.3931 2013-08-12 00:00:00.000 acnactr     275.1943 2013-08-09 00:00:00.000 acnactr     268.8868 2013-08-08 00:00:00.000 acnactr     265.7915 2013-08-07 00:00:00.000 acnactr     264.8321 2013-08-13 00:00:00.000 acnittr     145.3845 2013-08-12 00:00:00.000 acnittr     144.1252 2013-08-09 00:00:00.000 acnittr     143.2331 2013-08-08 00:00:00.000 acnittr     141.4968 2013-08-07 00:00:00.000 acnittr     140.6079

how write sql query in order subtract indx_val indx_val of previous date dates. find daily returns essentially. example abqi 1571.93 - 1568.55 return date 2012-08-13 , forth. result have dt column, indx_nm column, , dly_rtn column. thank you!

try following:

;with cte (     select dt, indx_nm, indx_val,         rn = row_number() on (partition indx_nm order dt desc)     tablename ) select c1.dt, c1.indx_nm, c1.indx_val - c2.indx_val dly_rtn cte c1     left join cte c2 on c2.rn = c1.rn + 1 , c2.indx_nm = c1.indx_nm order c1.indx_nm, c1.dt desc

also, if query supposed run quite frequently, recommend having index:

create unique index ix_tablename_1     on tablename (indx_nm, dt desc) include (indx_val)

Comments

Post a Comment

Popular posts from this blog

c# - Send Image in Json : 400 Bad request -

from android trying send image class of data, iis webservice. (c#) the problem 400 bad request . the image being encoded base64 . , placed json rest of class elements. my guess base64 not valid inside json. server not understand it. if set string "" , post accepted fine. so question is, how make base64 valid within json array? ( tried url.encode no success). or how should send image android webservice? gson gson = new gson(); string json = gson.tojson(record); // record has param { string base64photo } how big image? i'm pretty sure surpassing iis json size limit (default 4 mb). check http://geekswithblogs.net/frankw/archive/2008/08/05/how-to-configure-maxjsonlength-in-asp.net-ajax-applications.aspx or http://www.webtrenches.com/post.cfm/iis7-file-upload-size-limits good luck!
Read more

jquery - Fancybox - apply a function to several elements -

this source code below posted cristiano g. carvalho in answer question: calling fancybox gallery other link made user. <div class="details_gallery"> <a href="#" class="manualfancybox">manual call fancybox</a> <div class="details_gallery_min"> <a rel="details" href="max/1.jpg" class="fancybox"><img src="min/1.jpg" alt="" /></a> <a rel="details" href="max/2.jpg" class="fancybox"><img src="min/2.jpg" alt="" /></a> <a rel="details" href="max/3.jpg" class="fancybox"><img src="min/3.jpg" alt="" /></a> <a rel="details" href="max/4.jpg" class="fancybox"><img src="min/4.jpg" alt="" /></a> </div> </div> <script> $(document).read
Read more

An easy way to program an Android keyboard layout app -

i program android app replaces standard keyboard 1 one-hand optimized coffee++ keyboard layout. what special problems have face in progress? guess such project go deep android core, cause keyboard such essential thing. is wise start android developer tools (adt)—eclipse plugin described in this tutorial ? or there better way achieve goal? i new android programming, firm in php, mysql , javascript , use eclipse php i guess such project go deep android core, cause keyboard such essential thing. no. can create inputmethodservice implementation of keyboard. there sample soft keyboard in android sdk installation (if chose download sample code sdk manager), , there open source input methods floating around well, such hacker's keyboard. inputmethodservice distributed part of ordinary android application, , user can elect activate input method if user chooses. is wise start android developer tools (adt)—eclipse plugin described in tutorial? that fine s
Read more