sql - Get MAX() on repeating IDs -


this how query results currently. how can max() value each unique id ?

ie, 

for 5267139 8. 5267145 4  5267136 5 5267137 8 5267137 2 5267139 8 5267139 5 5267139 3 5267141 4 5267141 3 5267145 4 5267145 3 5267146 1 5267147 2 5267152 3 5267153 3 5267155 8       select distinct st.scoreid, st.scoretrackingtypeid     scoretrackingtype stt     left join scoretracking st     on stt.scoretrackingtypeid = st.scoretrackingtypeid     order st.scoreid, st.scoretrackingtypeid desc

results

group by partition table separate blocks based on column(s) specify. can apply aggregate function (max in case) against each of blocks -- behavior applies default below syntax:

select first_column, max(second_column) max_second_column table group first_column

edit: based on query above, looks don't need scoretrackingtype table @ all, leaving in place, use:

select st.scoreid, max(st.scoretrackingtypeid) scoretrackingtypeid scoretrackingtype stt     left join scoretracking st on stt.scoretrackingtypeid = st.scoretrackingtypeid group st.scoreid order st.scoreid

the group by obviate need distinct, max give value looking for, , order by still apply, since there single scoretrackingtypeid value each scoreid can pull out of ordering.


Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

php - Nothing but 'run(); ' when browsing to my local project, how do I fix this? -

i added new project. made mistake in projectname.conf file in sites-available apache2, led me reinstalling apache2. after reinstalling , re-enabling projects on every page of every project .. <body> run(); </body> .. i've run composer update, restarted service, restarted pc, checked config files, tried disabling new project. there nothing in error log, , access.log: 127.0.0.1 - - [15/may/2015:01:40:47 +0200] "get / http/1.1" 304 181 "-" "mozilla/5.0 (x11; ubuntu; linux x86_64; rv:38.0) gecko/20100101 firefox/38.0" maybe i'm forgetting apache2 reinstall? don't think did different last time installed it. looks haven't setup php correctly. take @ this great guide , maybe you're forgetting link php config apache2.
Read more

php - How can I echo out this array? -

i don't know how go grabbing data in variable , put foreach loop. class tree{ private $info = array( array('name'=>'jim','state'=>'nu','company'=>'nu','phone'=>array('cell'=>'5615111111','office'=>'5611111111'),'email'=>array('primary'=>'exs@example.com','ex@there.com')), array('name'=>'joe smith','city'=>'phoenix','phone'=>'4805551111','email'=>'jsmith@some_email.com'), array('name'=>'john doe','city'=>'chandler','company'=>'doe co.','email'=>array('jdoe@gmail.com','personal'=>'email@email.com'),'phone'=>'6025550002') ); } if you're inside of class, can access private variable using $this->variablename . example, i
Read more