56 lines
1.9 KiB
Markdown
56 lines
1.9 KiB
Markdown
# Xinhan 数据表结构说明
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本文档提供针对 xinhan 表的 SQL 创建语句与示例查询。注意：以下 SQL 仅用于创建结构；本任务仅生成 MD 文档，不执行 SQL。
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## 数据字段与含义
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- self_number: 自编号，文本类型，用于内部检索
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- tracking_number: 快递号，文本类型，用于记录物流单号
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- recipient: 收件人，为文本类型，必填
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- content: 内容物，文本型，可包含多行描述
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- sent_date: 寄出日期，时间戳（timestamptz/ TIMESTAMP），必填
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- destination: 寄达地，文本
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- arrival_date: 寄达日期，时间戳
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## 建表 SQL（PostgreSQL，Supabase/ Postgres 兼容）
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```sql
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CREATE TABLE xinhan (
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id SERIAL PRIMARY KEY,
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self_number TEXT,
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tracking_number TEXT,
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recipient TEXT NOT NULL,
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content TEXT,
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sent_date TIMESTAMP WITHOUT TIME ZONE NOT NULL,
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destination TEXT,
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arrival_date TIMESTAMP WITHOUT TIME ZONE
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);
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-- 索引，提升按自编号、快递号、收件人、寄出日期/寄达日期的查询性能
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CREATE INDEX IF NOT EXISTS idx_xinhan_self_number ON xinhan (self_number);
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CREATE INDEX IF NOT EXISTS idx_xinhan_tracking_number ON xinhan (tracking_number);
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CREATE INDEX IF NOT EXISTS idx_xinhan_recipient ON xinhan (recipient);
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CREATE INDEX IF NOT EXISTS idx_xinhan_sent_date ON xinhan (sent_date);
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CREATE INDEX IF NOT EXISTS idx_xinhan_arrival_date ON xinhan (arrival_date);
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```
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## 示例查询
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```sql
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-- 查询某个收件人相关信函的简单示例
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SELECT * FROM xinhan
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WHERE recipient ILIKE '%张三%'
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ORDER BY sent_date DESC
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LIMIT 100;
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-- 根据自编号查询示例
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SELECT * FROM xinhan
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WHERE self_number ILIKE '%XH-2026-001%'
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ORDER BY sent_date DESC
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LIMIT 100;
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-- 根据日期范围查询示例
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SELECT * FROM xinhan
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WHERE sent_date BETWEEN '2024-01-01' AND '2026-12-31'
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ORDER BY sent_date DESC;
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```
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> 说明：此文件仅用于记录数据库结构与查询示例，实际部署请在你的数据库实例中执行上述 SQL。
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