php mysql显示的意见

Question

感谢loking。

我有3个表

书籍，book_category，book_click。

书表 book_id， 网址， 标题， IMG， SHORT_DESC，特色 ， 使

book_category表 book_id，CATEGORY_ID

book_clicks表 SITE_ID ，时间，意见

我想通过视图从书表中获取数据SUMS但这只能返回一个结果

SELECT books.book_id, url, title, short_desc, img, featured, SUM(views) as total_views 
FROM books,book_category,book_click WHERE enable=1 AND category_id=7 
AND books.book_id=book_category.book_id 
ORDER BY strong texttotal_views DESC 

Answer 1

结帐WITH ROLLUP mysql的

UPDATE

阅读后你的问题再次它可能就像添加GROUP BY books.book_id

SELECT books.book_id, url, title, short_desc, img, featured, SUM(views) as total_views 
FROM books,book_category,book_click WHERE enable=1 AND category_id=7 
AND books.book_id=book_category.book_id 
ORDER BY strong texttotal_views DESC GROUP BY books.book_id 

原来的答案：

http://dev.mysql.com/doc/refman/5.1/en/group-by-modifiers.html

SELECT books.book_id, url, title, short_desc, img, featured, SUM(views) as total_views 
FROM books,book_category,book_click WHERE enable=1 AND category_id=7 
AND books.book_id=book_category.book_id 
ORDER BY strong texttotal_views DESC GROUP BY your_grouping WITH ROLLUP; 

例

mysql> SELECT year, country, product, SUM(profit) 
    -> FROM sales 
    -> GROUP BY year, country, product WITH ROLLUP; 
+------+---------+------------+-------------+ 
| year | country | product | SUM(profit) | 
+------+---------+------------+-------------+ 
| 2000 | Finland | Computer |  1500 | 
| 2000 | Finland | Phone  |   100 | 
| 2000 | Finland | NULL  |  1600 | 
| 2000 | India | Calculator |   150 | 
| 2000 | India | Computer |  1200 | 
| 2000 | India | NULL  |  1350 |