28 lines
692 B
SQL
28 lines
692 B
SQL
-- 为 positions 表添加唯一约束
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-- 这样 ON CONFLICT 才能正常工作
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-- 1. 先删除现有的重复数据（如果有）
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WITH duplicates AS (
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SELECT id,
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ROW_NUMBER() OVER (
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PARTITION BY body_id, time
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ORDER BY created_at DESC
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) as rn
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FROM positions
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)
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DELETE FROM positions
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WHERE id IN (
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SELECT id FROM duplicates WHERE rn > 1
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);
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-- 2. 添加唯一约束
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ALTER TABLE positions
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ADD CONSTRAINT positions_body_time_unique
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UNIQUE (body_id, time);
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-- 3. 验证约束已创建
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SELECT constraint_name, constraint_type
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FROM information_schema.table_constraints
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WHERE table_name = 'positions'
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AND constraint_type = 'UNIQUE';
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