The following two indexes are redundant in most SQL databases: CREATE INDEX i_actor_1 ON actor (last_name); CREATE INDEX i_actor_2 ON actor (last_name, first_name); It is usually safe to drop the first index, because all queries that query the LAST_NAME column only can still profit from the second index I_ACTOR_2. The reason being that LAST_NAME is … Continue reading How to Find Redundant Indexes in SQL
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