Table schema:
CREATE TABLE table_name_3 (district VARCHAR, weblink VARCHAR, college_or_campus_name VARCHAR)

Question: In which district is anna university - tiruchirappalli campus, whose website is http://www.annauniv.edu, located?
SQL: SELECT district FROM table_name_3 WHERE weblink = "http://www.annauniv.edu" AND college_or_campus_name = "anna university - tiruchirappalli campus"