Table: tallest_bridges
Columns: name
height_of_bridge_structure
longest_span
type
opened
location

Question: How tall is the Anqing Bridge which opened prior to 2011?
SQL: SELECT "height_of_bridge_structure" FROM tallest_bridges WHERE "opened" < 2011 AND "name" = 'anqing bridge'

Question: Where did the cable-stayed Badong Bridge  open in 2005?
SQL: SELECT "location" FROM tallest_bridges WHERE "type" = 'cable-stayed' AND "opened" = 2005 AND "name" = 'badong bridge'