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-- 实验 5-10 ERP Agent —— 书中要求的 PostgreSQL schema(两张表)。
--
-- 本仓库的可运行演示用 SQLite(零依赖、可离线复现,见 seed.py / demo.py);
-- 这份 DDL 给出书中原文的 PostgreSQL 版本,方便迁移到真实 Postgres 环境。
-- 两种方言的表结构一致,差异主要在日期函数:
-- SQLite: strftime('%Y','now') julianday(a)-julianday(b) date('now','-1 year')
-- PostgreSQL: EXTRACT(YEAR FROM now()) (a::date - b::date) now() - interval '1 year'
--
-- 用法(需本机有 PostgreSQL):
-- createdb erp
-- psql erp -f schema_postgres.sql
DROP TABLE IF EXISTS salaries;
DROP TABLE IF EXISTS employees;
-- 员工表:ID、姓名、部门、级别(数字越大越高)、入职日期、离职日期(NULL = 在职)
CREATE TABLE employees (
emp_id INTEGER PRIMARY KEY,
name TEXT NOT NULL,
department TEXT NOT NULL,
level INTEGER NOT NULL,
hire_date DATE NOT NULL,
leave_date DATE -- NULL 表示在职
);
-- 工资表:员工ID、发薪日期(每月一条,取当月 1 号)、当月工资
CREATE TABLE salaries (
emp_id INTEGER NOT NULL REFERENCES employees(emp_id),
pay_date DATE NOT NULL, -- 每月一条,如 2025-03-01
salary INTEGER NOT NULL,
PRIMARY KEY (emp_id, pay_date)
);
CREATE INDEX idx_salaries_pay_date ON salaries (pay_date);