Suppose I have a column DateCreated (datetime) in a table, for this column, actually each row has different value.
Question: if index on this column improve performance? Or no need to create index for this kind of column?
Suppose I have a column DateCreated (datetime) in a table, for this column, actually each row has different value.
Question: if index on this column improve performance? Or no need to create index for this kind of column?