我有两张表如下：
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Directories Items
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ID |Name |Parent ID |Name |Directory
1 |All |null 1 |Simpson |6
2 |Movies |1 2 |Avatar |5
3 |Clips |1 3 |Tom&Jerry |6
4 |Games |1 4 |CoD |7
5 |Action |2 5 |CS |7
6 |Cartoon |2 6 |NFS |8
7 |Shooter |4 7 |Halo |7
8 |Racing |4 8 |F4 |8
9 |Music |3 9 |Thriller |9
10 |Beat it |3
我想获得结果，以查看目录中每个目录中有多少项目 上面的表格，我只能指望一个特定的目录，但是对所有类别使用一个查询都不成功，所以我该怎么做，谢谢。
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Result
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ID |Name |Items Count
1 |All |10
2 |Movies |3
3 |Clips |2
4 |Games |5
5 |Action |1
6 |Cartoon |2
7 |Shooter |3
8 |Racing |2
9 |Music |1