16 lines
702 B
MySQL
16 lines
702 B
MySQL
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-- Remove duplicate participant_expected_values rows before adding unique constraint.
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-- For each (participant_id, sports_season_id) group with duplicates, keep the row
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-- that has a non-null source_elo (preferred) or the most recently updated row.
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DELETE FROM participant_expected_values
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WHERE id NOT IN (
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SELECT DISTINCT ON (participant_id, sports_season_id) id
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FROM participant_expected_values
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ORDER BY participant_id, sports_season_id,
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(source_elo IS NOT NULL) DESC,
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updated_at DESC
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);
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-- Now add unique constraint to prevent future duplicates.
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CREATE UNIQUE INDEX "participant_ev_participant_season_unique"
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ON "participant_expected_values" ("participant_id", "sports_season_id");
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