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no performance difference between a statement that includes a subquery and a semantically equivalent version that does not
. However, in some cases where existence must be checked, a join yields better performance
. Otherwise, the nested query must be processed for each result of the outer query to ensure elimination of duplicates. In such cases, a join approach would yield better results.ES
no performance difference between a statement that includes a subquery and a semantically equivalent version that does not
. However, in some cases where existence must be checked, a join yields better performance
. Otherwise, the nested query must be processed for each result of the outer query to ensure elimination of duplicates. In such cases, a join approach would yield better results.ES
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