Table: tallest_structures
Columns: name
country
town
height_metres_ft
structural_type
held_record

Question: What is the height in Rouen?
SQL: SELECT "height_metres_ft" FROM tallest_structures WHERE "town" = 'rouen'

Question: What is the church made from in Hamburg?
SQL: SELECT "held_record" FROM tallest_structures WHERE "structural_type" = 'church' AND "town" = 'hamburg'