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there is one situation where Oracle can still use an index if the first column in the index is not present in your SQL statement if the first column in the index has low cardinality meaning that there are relatively few distinct values Oracle can perform what is known as an index skip scan operation the key to this is the number of distinct values in the First Column of the index if there are a few dozen or less distinct values then there is a stronger chance that Oracle will be able to perform a skip scan operation for columns that have larger number of distinct values than a skip scan operation wonamp;#39;t make sense so what does oracle do when it performs a skip scan operation what is actually happening is that Oracle gets all the distinct values of the First Column of the index and then combines these with the values provided as access predicates in your SQL statement so in this table that we see here it is the last name in first name values that were provided in our SQL statemen