mysql - Can SQL query do this? -


i have table "audit" "description" column, "record_id" column , "record_date" column. want select records description matches 1 of 2 possible strings (say, "new%" or "arch%") record_id in each of 2 matches each other. need calculate difference in days between record_date of each other.

for instance, table may contain:

id   description    record_id    record_date 1    new sub        1000         04/14/13 2    mod            1000         04/14/13 3    archived       1000         04/15/13 4    new sub        1001         04/13/13

i want select rows 1 , 3 , calculate number of days between 4/15 , 4/14 determine how long took go new archived record (1000). both new , archived entry must present record counted (i don't care ones haven't been archived). make sense , possible calculate in sql query? don't know beyond basic sql.

i using mysql workbench this.

the following untested, should work asuming given record_id can show once "new sub" , "archived"

select n.id new_id       ,a.id archive_id       ,record_id       ,n.record_date new_date       ,a.record_date archive_date       ,datediff(a.record_date, n.record_date) days_between   audit n   join audit using(record_id)  n.description = 'new sub'    , a.description = 'archieved';

i changed or and, because thought wanted nr of days between records archived.


Comments

Post a Comment

Popular posts from this blog

jquery - How can I dynamically add a browser tab? -

since using iframes house external pages are, accounts "not preferred method" , disallowed sites (flickr, one), want dynamically generate browser tabs. e.g., when user submits form, want dynamically generate tab on browser in response submitted. e.g., might want add new tab url like: http://www.bigsurgarrapata.com/contact how in jquery? you want form target attribute action attribute. http://www.w3schools.com/tags/att_form_target.asp browsers have ultimate control on result of target attribute open new tab value of _blank. <form action="contact_submit.php" target="_blank" method="post">
Read more

keyboard - C++ GetAsyncKeyState alternative -

i using windows.h library's getasynckeystate function define key pushed on keyboard . here program returns int value of pushed key example. #include <iostream> #include <windows.h> using namespace std; int main (){ char i; for(i=8;i<190;i++){ if(getasynckeystate(i)== -32767){ cout<<int (i)<<endl; } } return 0; } but trying make opengl simple game , function appeared slow . there function not need cycle 180 times , if statement . thanks you're trying make opengl game, you're going use glfw. if that's case can away using glfwgetkey() such: if (glfwgetkey(glfw_key_up) == glfw_press) {...} if (glfwgetkey(glfw_key_down) == glfw_press) {...} that method nicely explained in tutorial 6 opengl-tutorial.org . should start first tutorial of beginners tutorials , later intermediate tutorials . if you're going make win32 window can listen wm_keydown or wm_keyup messages , virtua...
Read more

android - java.net.UnknownHostException(Unable to resolve host “URL”: No address associated with hostname) -

i developing app testing asp.net webservice in android.for simple webservice adding 2 numbers used.where numbers passed parameters.the result in dialogue.the webserver works in local. when application runs following result exception.i provided internet permission in manifest. java.net.unknownhostexception(unable resolve host “ http://url.com/ ”: no address associated hostname) my code given below main activity public static string rslt=""; /** called when activity first created. */ @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); button b1=(button)findviewbyid(r.id.button1); final alertdialog ad=new alertdialog.builder(this).create(); b1.setonclicklistener(new onclicklistener() { @override public void onclick(view arg0) { // todo auto-generated method stub try { ...
Read more