CREATE TABLE table_50134 ("Model" TEXT, "Manufacturer" TEXT, "Weight  ( kg ) " FLOAT, "Display size  ( in ) " FLOAT, "Processor model" TEXT, "Storage type" TEXT)

Which Display size (in) has a Model of vaio pcg-u3?
SELECT COUNT("Display size (in)") FROM table_50134 WHERE "Model" = 'vaio pcg-u3'
SELECT COUNT("Display size (in)") FROM "table_50134" WHERE "Model" = 'vaio pcg-u3'