Question

我有3个表：Book，Customer和Trans。我正在尝试编写一个选择查询，报告9月份购买图书的所有人的Name和Book标题。表已成功创建，并且所有数据都在其中，但我无法使此选择查询生效。我尝试了一切。这就是我所拥有的：

SELECT DISTINCT c.Name, b.Title, t.TDate
FROM Customer as c, Book as b, Trans as t;
WHERE c.ID=t.ID AND b.BookID=t.BookID and t.TDate < '2003-10-01';

我也试图避免重复。

Answer 1

SELECT c.Name, b.Title
FROM Customer as c
JOIN Trans as t ON c.ID = t.ID
JOIN Book as b ON b.BookID = t.BookID
WHERE t.TDate >= '2003-10-01' and t.TDate < '2003-11-01'
GROUP BY c.Name, b.Title

SQL新手，我遇到了Select查询的问题

1 个答案: