sql - Get the most recent record of with unique fields -


i have table in database, , build query return records date contained in last 7 days, number maximum , records group foo_id. example:

+---------------------------------------------------+ | id | number |            date            | foo_id | +---------------------------------------------------+ |   0|     29 | 2013-10-01 08:52:00.000000 |      7 | |   1|     12 | 2013-10-02 08:52:00.000000 |      7 | |   2|     23 | 2013-10-02 08:52:00.000000 |      2 | |   3|     42 | 2013-10-02 08:52:00.000000 |      2 | +---------------------------------------------------+

the query returns:

|   3|     42 | 2013-10-02 08:52:00.000000 |      2 | |   0|     29 | 2013-10-01 08:52:00.000000 |      7 |

i have build query, doesn't work @ all:

calendar time = calendar.getinstance(); time.add(calendar.date, -7);  querybuilder<greattable, integer> qbt = dao.querybuilder(); qbt.where().ge(greattable.date_column_name, time.gettime()); qbt.orderby(greattable.date_column_name, false).orderby(greattable.number_column_name, false); qbt.groupby(greattable.foo_id_column_name);

and output is:

|   1|     12 | 2013-10-02 08:52:00.000000 |      7 | |   2|     23 | 2013-10-02 08:52:00.000000 |      2 |

each group foo_id must record maximum number , date.

finally query looks like:

qbt.where().ge(greattable.date_column_name, time.gettime()); qbt.groupby(greattable.foo_id_column_name).having("max(" + greattable.date_column_name + ")"); qbt.orderby(greattable.date_column_name, true);

pd: when date added there little difference, example 2013-10-02 08:52:00.000000 , 2013-10-02 08:52:00.000010 trick order date too.


Comments

Post a Comment

Popular posts from this blog

java.util.scanner - How to read and add only numbers to array from a text file -

i'm learning java , have question regarding reading file want read numbers file contains strings well. here example of file: 66.56 "3 java 3-43 5-42 2.1 1 and here coding: public class test { public static void main (string [] args){ if (0 < args.length) { file x = new file(args[0]); try{ scanner in = new scanner( new fileinputstream(x)); arraylist<double> test = new arraylist<>(); while(in.hasnext()){ if(in.hasnextdouble()){ double f=in.nextdouble(); test.add(f);} else {in.next();} } catch(ioexception e) { system.err.println("exception during reading: " + e); } } my problem add 66.56,2.1 , 1 doesn't add 3 after "3 or ignores 3-43 , 5-42 can tell me how skip strings , add doubles here? thanks all said 3 ie; "3, 3-43 , 4-42 strings either u read string , split , check number @ " , - or put in space between characters , integers. jvm after compilation tre...
Read more

rewrite - Trouble with Wordpress multiple custom querystrings -

i'm working on adding multiple querystring , doesn't seem work. i've found codes seems work others might i'm missing something. i want like: http://mydomain.com/board/?getyear=2013&getsometext2=sometext to http://mydomain.com/board/2013/sometext/ i added code below functions.php file. doesn't seem work should though. this works. echoing querystring gets both variable without problem. http://mydomain.com/board/2013/sometext/ but doesn't. tested querystring vis isset() seems nothing being set/get http://mydomain.com/board/2013/ function add_query_vars($vars) { $vars[] = "getyear"; $vars[] = "getsometext2"; return $vars; } add_filter('query_vars', 'add_query_vars'); function add_rewrite_rules($arules) { $anewrules = array('board/([^/]+)/([^/]+)/?$' => 'index.php?pagename=board&getyear=$matches[1]&getsometext2=$matches[2]'); $arules = $a...
Read more