Posted 15 days ago. Visible to the public. Repeats. Linked content.

Heads up: counting may be slow in PostgreSQL

The linked article points out that COUNT queries might be unexpectetly slow in psql.
If you just need to know "are there any records" use any? or present? instead. The latter uses SELECT 1 AS one FROM ... LIMIT 1 under the hood.

In short: Replace foo.count > 0 with foo.any?

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Michael Leimstädtner
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7 days ago
by Henning Koch
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