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parse_url(url, partToExtract[, key]) - extracts a part from a URL
Parts: HOST, PATH, QUERY, REF, PROTOCOL, AUTHORITY, FILE, USERINFO
key specifies which query to extract
Example:
> SELECT parse_url('http://facebook.com/path/p1.php?query=1', 'HOST') FROM src LIMIT 1;
'facebook.com'
> SELECT parse_url('http://facebook.com/path/p1.php?query=1', 'QUERY') FROM src LIMIT 1;
'query=1'
> SELECT parse_url('http://facebook.com/path/p1.php?query=1', 'QUERY', 'query') FROM src LIMIT 1;
'1'
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