Re: how to optimise query for 10+ millions records
Sorry for my misunderstanding.
Please explain one thing - you wrote that Destination is an "outer table".
I ask because cannot find anywhere a definition of "outer table",only in MS SQL reference they mention that "outer table" is a left table for LEFT JOIN and right table for RIGHT JOIN.
Do you mean that Destination table is a left table in the LEFT OUTER JOIN ?
Or the opposite ?
If it is on the left side, and you use the condition:
IFNULL(destination.DestinationName,'Unknown') LIKE @dest
so it means that some records contain NULL in DestinationName column,
is this right ?
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