You should select as few rows as possible - e.g. if you have a table with 1,000,000 rows and your column only has 2,000 and you're selecting data only from that column, your database has less work to do. :)
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You should select as few rows as possible - e.g. if you have a table with 1,000,000 rows and your column only has 2,000 and you're selecting data only from that column, your database has less work to do. :)