HW 1 Query 1.
This page will implement the following websql query:
select d1.url,d1.title from document d1 such that http://www.umr.edu -> d1;


-> d1;



Steps to implement this query:
1. retrieve file (html file) at the URL.
Extra 1.1: get file check their length, calculate length
Extra 1.2: store url, length at document table for future queries
2. parse file, get all href tags.
3. Update anchor table: store url at anchor.base field, store href tags at anchor.href field.
4. search file (or retrieve files) mentioned at href tags.
5. get title of these files by searching (or parsing).
6. Output results:

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