[英]postgresql query merge rows into one
select ds.school_name_np,
case
when (ds.gender_id = 1 and ds.class=1) then ds.no_of_student
end as boys_1,
case
when (ds.gender_id = 2 and ds.class=1) then ds.no_of_student
end as girls_1,
case
when (ds.gender_id = 1 and ds.class=2) then ds.no_of_student
end as boys_2,
case
when (ds.gender_id = 2 and ds.class=2) then ds.no_of_student
end as girls_2
from data_047_differntly_abled_school_summary ds
-- GROUP BY school_name_np, gender_id, class, no_of_student
ORDER BY school_name_np
I have the above query that generates result as follows: 我有上面的查询,生成结果如下:
How do I get results for the same school in a single row? 如何单行获得同一所学校的成绩?
Simply use an aggregation function on each column: 只需在每列上使用聚合函数:
select ds.school_name_np,
MAX(case when ds.gender_id = 1 and ds.class=1 then s.no_of_student end) as boys_1,
MAX(case.....),
...
from data_047_differntly_abled_school_summary ds
GROUP BY school_name_np
ORDER BY school_name_np
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