postgresql query merge rows into one

Question

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:

enter image description here

How do I get results for the same school in a single row?

array_agg or string_agg and GROUP BY ... HAVING ...

Craig Ringer
– Craig Ringer

2017-08-24 06:50:47 +00:00
Commented Aug 24, 2017 at 6:50 — Craig Ringer
– Craig Ringer, Commented Aug 24, 2017 at 6:50

sagi · Accepted Answer · 2017-08-24 06:53:56Z

1

Simply use an aggregation function on each column:

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

answered Aug 24, 2017 at 6:53

sagi

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