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Lumbago
Norsk Yak Master
3271 Posts |
 Posted - 2011-05-20 : 04:17:52
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| I should probably know this (and I have a suggestion) but I'm asking for second opinions. I have this query: "select * from table where transferdate is null" where transferdate is a datetime column that gets populated after each row is transferred to another system. Data distribution is roughly 6 mill non-null values with one distinct value per day across a full year, and about 100k null rows. How would you index this column? Standard non-unique, nonclustered index? Filtered in some way..?- LumbagoMy blog-> http://thefirstsql.com/2011/02/07/regular-expressions-advanced-string-matching-and-new-split-function-sql-server-2008-r2/ |
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nigelrivett
Master Smack Fu Yak Hacker
3385 Posts |
Posted - 2011-05-20 : 05:36:01
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| Probably a filtered index.But I would populate that column with 19000101 on insert then update so that it is not going from null to a value.Then filter on 19000101.Would need to test to see what happens - I never trust these new features but this does seem to work the few times I've used it.==========================================Cursors are useful if you don't know sql.SSIS can be used in a similar way.Beer is not cold and it isn't fizzy. |
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Index, filtered or not