psql where里有自定义函数慢_零基础学习SQL-SQL高级功能：窗口函数（七）

INSERT INTO Product VALUES (‘0002’, ‘打孔器’, ‘办公用品’, 500, 320, ‘2009-09-11’);INSERT INTO Product VALUES (‘0006’, ‘叉子’, ‘厨房用具’,500, 0, ‘2009-09-20’);INSERT INTO Product VALUES (‘0008’, ‘圆珠笔’, ‘办公用品’,100, 0,‘2009-11-11’);