CREATE TABLE "colours_and_shapes" (
  "type_of_sign" text,
  "shape" text,
  "border" text,
  "background_colour" text,
  "text_symbol" text
);

Question: Which sign has a red border and a warning sign?
SQL: SELECT "text_symbol" FROM "colours_and_shapes" WHERE "border"='red' AND "type_of_sign"='warning';

Question: Which sign had a yellow background and a triangular shape?
SQL: SELECT "border" FROM "colours_and_shapes" WHERE "background_colour"='yellow' AND "shape"='triangular';

Question: Which sign has a red border?
SQL: SELECT "text_symbol" FROM "colours_and_shapes" WHERE "border"='red';

Question: Which color is the background of the mandatory instructions?
SQL: SELECT "background_colour" FROM "colours_and_shapes" WHERE "type_of_sign"='mandatory instructions';

Question: What is the color of the background of the white border and sign of information?
SQL: SELECT "background_colour" FROM "colours_and_shapes" WHERE "border"='white' AND "type_of_sign"='information';