21 lines
530 B
PL/PgSQL
21 lines
530 B
PL/PgSQL
BEGIN;
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ALTER TABLE IF EXISTS list_users
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ADD COLUMN IF NOT EXISTS position BIGINT NOT NULL DEFAULT 0;
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CREATE INDEX IF NOT EXISTS idx_list_users_user_id_position ON list_users (user_id, position);
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UPDATE list_users lu
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SET position = r.rn - 1
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FROM (SELECT list_id,
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user_id,
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row_number() OVER (
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PARTITION BY user_id
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ORDER BY created_at, list_id
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) AS rn
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FROM list_users) r
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WHERE lu.list_id = r.list_id
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AND lu.user_id = r.user_id;
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COMMIT;
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