Question

I built the following query:

SELECT GVA14.COD_ZONA, Sum(GVA12.IMPORTE) AS SumOfIMPORTE
FROM GVA14 LEFT JOIN GVA12 
  ON GVA14.COD_CLIENT = GVA12.COD_CLIENT
WHERE Month(GVA12.FECHA_EMIS)=Month(curdate())
AND Year(GVA12.FECHA_EMIS)=Year(curdate())
GROUP BY GVA14.COD_ZONA;

But there are other values in the COD_ZONA that I want to display. These are there if I take the Month and Year filters away. Here is a SQL Fiddle for anyone intrested. http://sqlfiddle.com/#!2/3aae1/3

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Edit 1#

I now have the following query:

SELECT GVA14.COD_ZONA, Coalesce(Sum(GVA12.IMPORTE), 0) AS SumOfIMPORTE
FROM GVA14 
LEFT JOIN GVA12 
  ON GVA14.COD_CLIENT = GVA12.COD_CLIENT
  AND Month(GVA12.FECHA_EMIS)=Month(curdate())
  AND Year(GVA12.FECHA_EMIS)=Year(curdate())
GROUP BY GVA14.COD_ZONA;

But when I try and execute it, it takes 110 secs aprox and the program I need it for times out before that. I’ve created an index on the suggestion of @Bluefeet and called it Zones and included the GVA14.COD_ZONA in it.

What do I do next?

Answer 1

I’ve fixed this by adding 4 indexes (don’t know if that’s too many!) on the tables. It worked…