SELECT id,year,MAX(count)
FROM table
GROUP BY id;@H_404_14@ 
 
不幸的是,它给我一个错误：
 
  
 
 
  
ERROR: column “table.year” must appear in the GROUP BY clause or be
 used in an aggregate function
 
 
 
 
所以我试试：
 
  
 
SELECT id,MAX(count)
FROM table
GROUP BY id,year;@H_404_14@ 
 
但是,它不做MAX(计数),它只是显示表.我想,因为当按年份和身份分组时,它会获得该特定年份的最大值.
 
 
那么,怎么写这个查询呢？我想得到ID的MAX(计数)和发生的那一年.

select *
from (
  select id,thing,max(thing) over (partition by id) as max_thing
  from the_table
) t
where thing = max_thing@H_404_14@ 
 
要么：
 
  
 
select t1.id,t1.year,t1.thing
from the_table t1
where t1.thing = (select max(t2.thing) 
                  from the_table t2
                  where t2.id = t1.id);@H_404_14@ 
 
要么
 
  
 
select t1.id,t1.thing
from the_table t1
  join ( 
    select id,max(t2.thing) as max_thing
    from the_table t2
    group by id
  ) t on t.id = t1.id and t.max_thing = t1.thing@H_404_14@ 
 
或(与以前的不同符号相同)
 
  
 
with max_stuff as (
  select id,max(t2.thing) as max_thing
  from the_table t2
  group by id
) 
select t1.id,t1.thing
from the_table t1
  join max_stuff t2 
    on t1.id = t2.id 
   and t1.thing = t2.max_thing@H_404_14@