Show the first year and last year of parties with theme "Spring" or "Teqnology".
SELECT First_year ,  Last_year FROM party WHERE Party_Theme  =  "Spring" OR Party_Theme  =  "Teqnology"
first year refers to MIN(year); last year refers to MAX(year); parties with theme 'Spring' or 'Teqnology' refers to Party_Theme = 'Spring' OR Party_Theme = 'Teqnology';