数据库操作，bc++，学习资料，BC6环境下或更高版本-Database operations, bc++, learning materials, BC6 or later under

通过它我们可以查询从公元前2100000000年到公元后21000000000年的每一天的日历-Through which we can query 2,100,000,000 BC to AD 21 billion each day in the calendar