Question

I have this table:

This selection is is duplicated many times for different var_lines (which pretty much work as one row of data, or respondent for a survey) and set_codes (different survey codes).

With this query:

SELECT
    *, COUNT(*) AS total
FROM
    `data`
WHERE
    `var_name` = 'GND.NEWS.INT'
AND(
    `set_code` = 'BAN11A-GND'
    OR `set_code` = 'BAN09A-GND'
    OR `set_code` = 'ALG11A-GND'
)
AND `country_id` = '5'
GROUP BY
    `data_content`,
    `set_code`
ORDER BY
    `set_code`,
    `data_content`

The query basically counts the number of answers for a specific question. Then groups them survey (set_code).

What I need is for each of the grouped data_content answers for GND.NEWS.INT to also show the SUM of all the corresponding GND_WT with the same var_line.

For example if I had this:

data_id    data_content    var_name    var_line
1          2               GND.NEW.INT 1
2          1.4             GND_WT      1
3          2               GND.NEW.INT 2
4          1.6             GND_WT      2
5          3               GND.NEW.INT 3
6          0.6             GND_WT      3

I would get something like this:

data_id    data_content    var_name      var_line   total   weight
1          2               GND.NEW.INT   1          2       3
5          3               GND.NEW.INT   3          1       0.6

Thanks for any help.

Answer 1

Your requirements are not exactly clear, but I think the following gives you what you want:

select d1.data_id,
  d1.data_content,
  d1.var_name,
  d1.var_line,
  t.total,
  w.weight
from data d1
inner join
(
  select data_content,
    count(data_content) Total
  from data
  group by data_content
) t
  on d1.data_content = t.data_content
inner join
(
  select var_line,
    sum(case when var_name = 'GND_WT' then data_content end) weight
  from data
  group by var_line
) w
  on d1.var_line = w.var_line
where d1.var_name = 'GND.NEW.INT'

See SQL Fiddle with Demo