CREATE TABLE "dimensions" (
  "length_feet_m" text,
  "width_feet_m" text,
  "load_short_tons_mt" text,
  "truss_type_s" text,
  "year_built" text,
  "source_year" text
);

Question: What is the width feet in meeters for the truss with a source of nbi (2009)?
SQL: SELECT "width_feet_m" FROM "dimensions" WHERE "source_year"='nbi (2009)';

Question: What is the width for hte truss with a source of zacher (1994)?
SQL: SELECT "width_feet_m" FROM "dimensions" WHERE "source_year"='zacher (1994)';