OK to have index with 90% null values?

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Thomas Gagne

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OK to have index with 90% null values? - 07-21-2004 , 10:24 PM

I have a table where 90% of the rows will have null for the field
"depositDate", but I need to have a query that finds the rows with a specific
depositDate. Without an index I need to scan the entire table.

Is there a problem with that?

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