mysql - SQL: how to group by max date -


i'm pretty new sql, please excuse seems should basic query. i've been searching , trying convert other similar answer's code make mine work, can't seem right.

i have 2 tables. tables linked via unique employee id(emplid). table 1(job) houses various job related information title , table 2(title_changes) houses promotion actions, reasons, , dates. need develop query returns * both job , title_changes tables based on recent title_changes date.

fyi not mirror actual table data. oversimplifying make easier explain.

it should return:  emlpid |     title    |titledate   |titlechnagereason|requested_date  12345  |  specialist 2| 02/01/2015|      merit       |01/31/2015  job table       emplid    |         title       | title date   ---------+---------------+----------------+    12345      |  specialist 2       | 02/01/2015        --------+----------------+----------------    12345      |  specialist 1       | 09/01/2014   --------+----------------+----------------    44576      |  analyst 3          | 05/01/2015   --------+----------------+----------------    44576      |  analyst 2          | 03/01/2014   --------+---------------------+-----------    title_changes table    emplid    | title change reason | requested_date   ------------+---------------------+----------------+    12345      |  merit              | 01/31/2015   ------------+---------------------+----------------    12345      |  newhire            | 08/30/2014   ------------+---------------------+----------------    44576      |  promotion          | 04/30/2015   ------------+---------------------+----------------    44576      |  newhire            | 02/28/2014   ------------+---------------------+----------------

thanks help!

craig

try query

select j.emplid,  substring_index(group_concat(j.title order j.titledate desc),',',1) title, substring_index(group_concat(j.titledate order j.titledate desc),',',1) title_date,  substring_index(group_concat(tc.titlechnagereason order tc.requested_date desc),',',1) title_change_reson, substring_index(group_concat(tc.requested_date order tc.requested_date desc),',',1) request_date, job j join title_changes tc on(tc.emplid = j.emplid) group j.emplid

Comments

Post a Comment

Popular posts from this blog

1111. appearing after print sequence - php -

morning, i have code takes string of shoe sizes, explodes , puts in table. code works , info displayed correctly on page after table there few 1's after table. i'm confused this. so table looks (in columns of 3 on webpage) available in following sizes: 3 4 5 6 9 10 111 here's codes, purpose of example $x = 3|4|6|10|9 function get_sizes_pipe($x) { $counter = 0; $splits = explode("|",$x); asort($splits); $x = print "<table class='greentable'>"; $x .= print "<thead><tr><th scope='col' colspan='3' abbr='starter'>available in following sizes:</th></tr></thead><tbody><tr>"; foreach ($splits $split) { $entry = print "<td>".$split."</td>"; if($counter == 2){ $entry .= print "</tr><tr>"; $counter =0; } else { $counter++; ...
Read more

java - WARN : org.springframework.web.servlet.PageNotFound - No mapping found for HTTP request with URI [/board/] in DispatcherServlet with name 'appServlet' -

this question has answer here: why spring mvc respond 404 , report “no mapping found http request uri […] in dispatcherservlet”? 3 answers i trying making simple bbs i'm encountering following error, warn : org.springframework.web.servlet.pagenotfound - no mapping found http request uri [/board/] in dispatcherservlet name 'appservlet' i have tried solve error many times, have failed. how can solve error? here web.xml, controllerand , servlet-context. my web.xml <?xml version="1.0" encoding="utf-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <filter-nam...
Read more

Ruby on Rails, ActiveRecord, Postgres, UTF-8 and ASCII-8BIT encodings -

weirdest error, who’s challenge try , me? spent hours yesterday on , it’s magic. can't believe happening , it's driving me crazy. btw, using: rails 4.2.3 ruby 2.2.3 pg 0.18 encoding.default_internal = encoding.default_external = utf-8 config.encoding = 'utf-8' it has postgres, activerecord , encodings! turns out we’ve been getting these errors whenever create new users on database special characters: encoding::undefinedconversionerror: "\xc3" ascii-8bit utf-8 \xc3 may vary depending on characters. weird part we’ve set since beginning utf-8. makes no sense , digged it, , used script: user.all.each |user| user.attributes.each |name, value| if value.is_a? string puts user.email + name.encoding.to_s + value.encoding.to_s end end end and output of 1 of users, users same: dr_lottahelp@blahblah.comutf-8utf-8 dr_lottahelp@blahblah.comutf-8ascii-8bit dr_lottahelp@blahblah.comutf-8ascii-8bit dr_lottahelp@blahblah.comutf-8asci...
Read more