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dpb/backend/sql/weld_trial_study_entry.sql
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-- ============================================================
-- AF 缺口批2-F1: trial_study_entry 参试条目 —— 区组号 block_no
-- ------------------------------------------------------------
-- 幂等。bre_trial_study_entry 表已由 bre_tables.sql 建好。
-- block_no 由 /statistics/trial-design RCBD 随机化生成落库。
-- ============================================================
ALTER TABLE bre_trial_study_entry ADD COLUMN IF NOT EXISTS block_no integer;