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Which of the following uses for indexes can be expected to improve performance? ( Select all uses that would normally be expected to improve performance
Which of the following uses for indexes can be expected to improve performance? Select all uses that would normally be expected to improve performance of requests.
a Indexing columns that are of high selectivity, such as Social Security Number, when those columns appear in WHERE clauses.
b Indexing columns that are not referenced in WHERE clauses.
c Indexing the foreign key columns of tables that reference other tables and are frequently joined to the other tables using an equality
d Indexing columns with long data types such as CHAR
e Indexing columns that appear frequently in WHERE clauses but are not primary keys.
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