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why am i getting a hash match join?

Posted By:      Posted Date: September 03, 2010    Points: 0   Category :Sql Server
I am joining two large tables, 100+million rows each. They each have a clustered index  on 1 column and I am joining those 2 columns together. I was thinking this join should be instant, but its taking longer than I expected. The query looks like this: SELECT a.Journal_ID FROM Fact.TableName a  INNER JOIN Journal.TableName j ON j.ID = a.Journal_ID   The execution plan is doing a index scan on each table (not on the clustered index) and then doing a hash match on the results.   In reality I want a bunch of columns back from "a" and a handful from "b". What would be the ideal index design in this example?Craig

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