oracle - SQL get LAST record for each ID after some Date -


i need creating sql statement retrieving last record after date each userid in user_log table.

i forgot write there few other columns in table.

table: user_log

 id  name    modify_date            modify_type  55  usera   2013-05-07 15:47:53.0  1 88  userb   2013-05-07 16:00:57.0  1 55  usera   2013-05-08 11:44:10.0  2 88  userb   2013-05-08 15:47:09.0  2  88  userb   2013-05-08 16:01:41.0  1     55  usera   2013-05-09 15:11:53.0  0 55  usera   2013-05-09 16:00:57.0  0 55  usera   2013-05-10 09:14:10.0  1 88  userb   2013-05-10 16:01:41.0  2 55  usera   2013-05-10 18:23:03.0  2 55  usera   2013-05-11 09:14:10.0  2 88  userb   2013-05-11 16:01:41.0  1 55  usera   2013-05-13 11:34:07.0  1 55  usera   2013-05-13 15:53:04.0  2 55  usera   2013-05-13 16:13:04.0  1 
example 1: users have bean changed after '2013-05-08 00:00:00.0'. must return: 
 id  name    modify_date            modify_type  55  usera   2013-05-07 15:47:53.0  1 88  userb   2013-05-07 16:00:57.0  1 55  usera   2013-05-08 11:44:10.0  2 88  userb   2013-05-08 15:47:09.0  2  88  userb   2013-05-08 16:01:41.0  1     55  usera   2013-05-09 15:11:53.0  0 55  usera   2013-05-09 16:00:57.0  0 55  usera   2013-05-10 09:14:10.0  1 88  userb   2013-05-10 16:01:41.0  2 55  usera   2013-05-10 18:23:03.0  2 55  usera   2013-05-11 09:14:10.0  2 **88    userb   2013-05-11 16:01:41.0  1**  return 55  usera   2013-05-13 11:34:07.0  1 55  usera   2013-05-13 15:53:04.0  2 **55    usera   2013-05-13 16:13:04.0  1**  return 
example 2: users have bean changed after '2013-05-12 00:00:00.0'. must return: 
 id  name    modify_date            modify_type  55  usera   2013-05-07 15:47:53.0  1 88  userb   2013-05-07 16:00:57.0  1 55  usera   2013-05-08 11:44:10.0  2 88  userb   2013-05-08 15:47:09.0  2  88  userb   2013-05-08 16:01:41.0  1     55  usera   2013-05-09 15:11:53.0  0 55  usera   2013-05-09 16:00:57.0  0 55  usera   2013-05-10 09:14:10.0  1 88  userb   2013-05-10 16:01:41.0  2 55  usera   2013-05-10 18:23:03.0  2 55  usera   2013-05-11 09:14:10.0  2 88  userb   2013-05-11 16:01:41.0  1   55  usera   2013-05-13 11:34:07.0  1 55  usera   2013-05-13 15:53:04.0  2 **55    usera   2013-05-13 16:13:04.0  1**  return

i found don't know put condition date after x:

select u1.* user_log u1 left join user_log u2 on (u1.id = u2.id , u1.modify_date < u2.modify_date ) u2.modify_date null;

can please me this?

well, these purposes analytical functions invented.

here are:

select distinct   id,   name,    last_value(modify_date) on (partition id order modify_date rows between unbounded preceding , unbounded following) modify_date   user_log   modify_date > :date

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

node.js - Getting the socket id,user id pair of a logged in user(s) -

i have web application done using node js , in it,i have authentication system requires users log in before can access pages. have 2 pages,the homepage , updates page. from read docs,a new socket id issued when user opens tab in browser. me being admin,i know socket id of logged in user , more so,the socket id,logged in user id pair logged in users. what method can use socket id,logged in user id pair make sure broadcast realtime info users online?.
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