29 lines
1.3 KiB
SQL
29 lines
1.3 KiB
SQL
-- =============================================
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-- Education 模块 — 练习会话与题目快照回滚
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-- Ticket #6 / Migration 002
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-- =============================================
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--
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-- WARNING: This file contains NO executable SQL.
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-- Destructive rollback (DROP TABLE) requires manual operator verification.
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--
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-- Manual rollback procedure (operator must execute):
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-- 1. Verify no other tables depend on these tables:
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-- SELECT TABLE_NAME, COLUMN_NAME, REFERENCED_TABLE_NAME
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-- FROM information_schema.KEY_COLUMN_USAGE
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-- WHERE REFERENCED_TABLE_NAME IN ('education_practice_session', 'education_practice_question')
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-- AND TABLE_SCHEMA = DATABASE();
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-- Result MUST be empty before proceeding.
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--
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-- 2. Verify the tables contain only data from this migration:
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-- SELECT COUNT(*) AS session_count FROM education_practice_session;
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-- SELECT COUNT(*) AS question_count FROM education_practice_question;
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-- Operator must confirm these counts are acceptable to destroy.
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--
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-- 3. After verification, execute:
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-- DROP TABLE IF EXISTS education_practice_question;
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-- DROP TABLE IF EXISTS education_practice_session;
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--
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-- DO NOT uncomment or execute the lines below without operator verification.
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-- -- DROP TABLE IF EXISTS education_practice_question;
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-- -- DROP TABLE IF EXISTS education_practice_session;
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