Results within radius - Optimising slow MySQL query

Question

SELECT property.paon, property.saon, property.street, property.postcode, property.lastSalePrice, property.lastTransferDate,
 epc.ADDRESS1, epc.POSTCODE, epc.TOTAL_FL         


        

Answer 1

You can do a few things:

• Create a new column so you don't need to use CONCAT CONCAT(property.paon, ', ', property.street) in the GROUP BY and the JOIN (this will speed it up a lot!)
• As JackHacks says you need to create indexes at the right spot. (property postcode and the newly created column, and epc postcode and address)
• Remove the HAVING with epc.TOTAL_FLOOR_AREA > 0 and add it to the WHERE

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