I have a table of postcodes and I want to update each postcode with its 3 nearest neighbours. Ie to fill in the blanks in this table: postcode nearestPostcode1 nearestPostcode2 nearestPostcode3 _______________________________________________________________ KY6 1DA - - - KY6 1DG - - - KY6 2DT - - - KY6 1RG - -. I've figured out a SELECT query to find the nearest postcodes and here is one clumsy way the first row could be updated: update table1 set nearestPostcode1 = (select query for returning the first nearest postcode), nearestPostcode2 = (select query for returning the second nearest postcode), nearestPostcode3 = (select query for returning the third nearest postcode) where postcode = 'KY6 1DA'; However this will result in 3 select queries being run for each row update. It would be more efficient if there was some way to do what is expressed by this pseudo code: update table1 set (nearestPostcode1, nearestPostcode2, nearestPostcode3) = (select query to return the 3 nearest postcodes) where postcode = 'KY6 1DA'; The 'select query' in the above looks like this: select postcode from postcodeTable order by ASC limit 3 Is there anyway for the rows returned from the select to be put into a form that they can be used to update multiple fields? Update Table1 Cross Join ( Select Min( Case When Z1.Num = 1 Then Z1.postcode End ) As PostCode1, Min( Case When Z1.Num = 2 Then Z1.postcode End ) As PostCode2, Min( Case When Z1.Num = 3 Then Z1.postcode End ) As PostCode3 From ( Select postcode, @num:= @num + 1 As Num From postcodeTable Where postcode = 'KY6 IDA' Order By ASC Limit 3 ) As Z1 ) As Z Set nearestPostCode1 = Z.PostCode1, nearestPostCode2 = Z.PostCode2, nearestPostCode3 = Z.PostCode3 Where Table1.postcode = 'KY6 IDA'.

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