11 lines
372 B
SQL
11 lines
372 B
SQL
-- 更新VIP客户表的索引结构
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USE carwash_booking;
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-- 1. 移除phone字段的UNIQUE约束（需要先删除原索引）
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ALTER TABLE vip_customers DROP INDEX phone;
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-- 2. 添加phone和car_number的复合唯一索引
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ALTER TABLE vip_customers ADD UNIQUE INDEX idx_phone_car_number (phone, car_number);
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-- 3. 验证索引添加成功
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SHOW INDEX FROM vip_customers; |