diff --git a/create_table.sql b/create_table.sql
new file mode 100644
index 0000000000000000000000000000000000000000..34f4f14b9c7b459e44f25c2f97b211439adea17d
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+++ b/create_table.sql
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+-- 创建 3 个示例表
+CREATE TABLE department
+    ( dept_id    INTEGER NOT NULL PRIMARY KEY
+    , dept_name  VARCHAR(50) NOT NULL
+    ) ;
+CREATE TABLE job
+    ( job_id         INTEGER NOT NULL PRIMARY KEY
+    , job_title      VARCHAR(50) NOT NULL
+    ) ;
+CREATE TABLE employee
+    ( emp_id    INTEGER NOT NULL PRIMARY KEY
+    , emp_name  VARCHAR(50) NOT NULL
+    , sex       VARCHAR(10) NOT NULL
+    , dept_id   INTEGER NOT NULL
+    , manager   INTEGER
+    , hire_date DATE NOT NULL
+    , job_id    INTEGER NOT NULL
+    , salary    NUMERIC(8,2) NOT NULL
+    , bonus     NUMERIC(8,2)
+    , email     VARCHAR(100) NOT NULL
+    , CONSTRAINT ck_emp_sex CHECK (sex IN ('男', '女'))
+    , CONSTRAINT ck_emp_salary CHECK (salary > 0)
+    , CONSTRAINT uk_emp_email UNIQUE (email)
+    , CONSTRAINT fk_emp_dept FOREIGN KEY (dept_id) REFERENCES department(dept_id)
+    , CONSTRAINT fk_emp_job FOREIGN KEY (job_id) REFERENCES job(job_id)
+    , CONSTRAINT fk_emp_manager FOREIGN KEY (manager) REFERENCES employee(emp_id)
+    ) ;
+CREATE INDEX idx_emp_name ON employee(emp_name);
+CREATE INDEX idx_emp_dept ON employee(dept_id);
+CREATE INDEX idx_emp_job ON employee(job_id);
+CREATE INDEX idx_emp_manager ON employee(manager);