id  name
1   tv
2   phone

id name
1  electronics
2  gift

pid cid
1   1
2   1
2   2

<h1>tv</h1>
<span>electronics</span>

<h1>phone</h1>
<span>electronics</span>
<span>gift</span>

<h1>tv</h1>
<span>electronics</span>

<h1>phone</h1>
<span>electronics</span>

<h1>phone</h1>
<span>gift</span>