Question

我正在尝试使用表格trip，guide和reservation来制作规范化表格。我收到错误“ORA-00933：SQL命令未正确结束。”

我不确定ALTER TABLE有什么问题。

SELECT trip.TRIP_ID, trip.State, trip.Max_grp_size, trip.type, trip.season, guide.Guide_num, guide.last_name, guide.First_name, guide.address, guide.city, guide.Hire_date, trip_guides.guide_num, reservations.trip_price
FROM trip
JOIN trip_guides ON trip.TRIP_ID = trip_guides.trip_id
JOIN Guide ON trip_guides.guide_num = guide.Guide_num
ALTER TABLE trip ADD (price_trip CHAR)
JOIN reservations ON trip.price_trip = reservations.trip_price
ORDER BY trip.trip_ID;

Answer 1

听起来你想要的是一个＆＃34;创建表... AS（SELECT ...）＆＃34;陈述的类型。基本上根据SQL语句的结果集创建一个新表。

这看起来像是：

CREATE TABLE your_1st_level_normalized_table AS
(
    SELECT trip.TRIP_ID,
        trip.STATE,
        trip.Max_grp_size,
        trip.type,
        trip.season,
        guide.Guide_num,
        guide.last_name,
        guide.First_name,
        guide.address,
        guide.city,
        guide.Hire_date,
        trip_guides.guide_num,
        reservations.trip_price,
        NULL as PRICE_TRIP /*new field in the new table set to NULL*/
    FROM trip
    JOIN trip_guides ON trip.TRIP_ID = trip_guides.trip_id
    JOIN Guide ON trip_guides.guide_num = guide.Guide_num
    JOIN reservations ON trip.price_trip = reservations.trip_price
);

我已删除了ORDER BY，因为此声明中不允许这样做。

我遇到了ALTER TABLE函数的问题

1 个答案: