Question

I have a duplicated COUNT on this query:

SELECT
DATE(dia.DTM) AS 'Dia',
COUNT(temp.TMP) AS 'Index'
FROM dados_meteo dia
INNER JOIN dados_meteo temp
ON temp.DTM = dia.DTM
AND temp.TMP BETWEEN 20 AND 30
WHERE dia.POM = 'Alcobaca'
GROUP BY DATE(dia.DTM)

Answer 1

If I understand correctly (please describe exacly what you want the query to do), you’ll get what you want by changing INNER JOIN to LEFT JOIN.

Or by this:

SELECT
    DATE(dia.DTM) AS 'Dia',
    SUM(dia.TMP BETWEEN 20 AND 30) AS 'Index'
FROM dados_meteo dia
WHERE dia.POM = 'Alcobaca'
GROUP BY DATE(dia.DTM)

What the above query is actually doing is this:

SELECT
    DATE(dia.DTM) AS 'Dia',
    COUNT( CASE WHEN dia.TMP BETWEEN 20 AND 30
                THEN 'yes'
                ELSE NULL
           END )
      AS 'Index'
FROM dados_meteo dia
WHERE dia.POM = 'Alcobaca'
GROUP BY DATE(dia.DTM)

---

After the comments, here’s a slight modification:

SELECT
    DATE(dia.DTM) AS 'Dia',
    CASE WHEN SUM(dia.TMP BETWEEN 20 AND 30) >= 24
         THEN 20
         ELSE -10
    END AS 'Index'
FROM dados_meteo dia
WHERE dia.POM = 'Alcobaca'
GROUP BY DATE(dia.DTM)