CREATE TABLE table_51703 ("Driver" CLOB, "Constructor" CLOB, "Laps" FLOAT, "Time/Retired" CLOB, "Grid" FLOAT)

Who constructed pedro diniz's car?
SELECT "Constructor" FROM table_51703 WHERE "Driver" = 'pedro diniz'
SELECT "Constructor" FROM "table_51703" WHERE "Driver" = 'pedro diniz'