表格1:
+---------+-------+-------------+
| Page | Title | Description |
+---------+-------+-------------+
| Apple | ..... | ........... |
| Orange | ..... | ........... |
| Pear | ..... | ........... |
| Grapes | ..... | ........... |
+---------+-------+-------------+
表2:
+----------+-------------+
| Link | Page |
+----------+-------------+
| Website1 | Apple |
| Website2 | Orange |
| Website3 | Apple |
| Website4 | Orange |
| Website5 | Apple |
| Website6 | Pear |
| Website7 | Apple |
| Website8 | Grapes |
| Website9 | Grapes |
+----------+-------------+
我想知道/返回表2中引用表1中的页数以及它们被引用的次数. (我不想知道表2中引用了表1中的每个页面的次数).
所以在这个例子中:
1页被引用1次(梨),
2页被引用2次(Grapes和Orange)&
1页被引用4次.
解决方法:
以下查询应该做..
SELECT COUNT(1) NoOfPages,CNT ReferencedTimes
FROM
(
SELECT T2.PAGE,COUNT(1) CNT
FROM TABLE1 T1 INNER JOIN TABLE2 T2 ON T1.PAGE = T2.PAGE
GROUP BY T2.PAGE
)T
GROUP BY CNT