SQL query to combine total of two fields - mysql

Question

I ought to combine two result fields based on my requirement. For example, below query provides the result as shown. But I need a case statement that states that both 'wind' and 'wind c' are the same, hence combine its total.
SELECT result, COUNT(*) AS total from(
SELECT t.Id AS Id,
CASE
WHEN LTRIM(RTRIM(AC)) = ' ' THEN AG
WHEN LOWER(AC) IS NOT NULL THEN LOWER(AC)
ELSE LOWER(AG)
END AS result,MaxDate,
FROM [DC_20160601] t
INNER JOIN ( SELECT Id, MAX(DateTime) AS MaxDate
FROM [DC_20160601]
GROUP BY Id) tm
ON t.Id = tm.Id AND t.DateTime = tm.MaxDate)
GROUP BY result
Current Result:
Result Total
Wind 1212
Wind c 345
sqrim 321
sqrim mob 123
Expected Result:
Result Total
Wind mobile 1557
Sqrim mobile 444

Answer 1

You can select the first word in a string via substring_index
SELECT SUBSTRING_INDEX(`result`, ' ', 1);
Now group by the first word of result
SELECT SUBSTRING_INDEX(`result`, ' ', 1), COUNT(*) AS total from(
SELECT t.Id AS Id,
CASE
WHEN LTRIM(RTRIM(AC)) = ' ' THEN AG
WHEN LOWER(AC) IS NOT NULL THEN LOWER(AC)
ELSE LOWER(AG)
END AS result,MaxDate,
FROM [DC_20160601] t
INNER JOIN ( SELECT Id, MAX(DateTime) AS MaxDate
FROM [DC_20160601]
GROUP BY Id) tm
ON t.Id = tm.Id AND t.DateTime = tm.MaxDate)
GROUP BY SUBSTRING_INDEX(`result`, ' ', 1)

Answer 2

You might try to extract everything before the first space and use this for grouping:
SUBSTRING_INDEX(result, ' ', 1)
Otherwise you need to maintain a lookup table to match multiple variations to a single result.

Answer 3

You can add the case statements as an outer query. Assuming that your query returns the Current Result that you posted, here is an example of the needed case statements:
select
case
when a.result = 'Wind' or a.result = 'Wind c' then 'Wind mobile'
else
case
when a.result = 'sqrim' or a.result = 'sqrim mob'
then 'Squirm mobile'
end
end as res,
sum(total)
from
(
SELECT result, COUNT(*) AS total from(
SELECT t.Id AS Id,
CASE
WHEN LTRIM(RTRIM(AC)) = ' ' THEN AG
WHEN LOWER(AC) IS NOT NULL THEN LOWER(AC)
ELSE LOWER(AG)
END AS result,MaxDate,
FROM [DC_20160601] t
INNER JOIN ( SELECT Id, MAX(DateTime) AS MaxDate
FROM [DC_20160601]
GROUP BY Id) tm
ON t.Id = tm.Id AND t.DateTime = tm.MaxDate)
GROUP BY result
) a
group by res
It would be best to have the values in the case statements specified in a lookup table and to get them from there or you can just add additional ones as case statements if needed but it's not ideal...
Hope this helps!