CREATE TABLE table_51512 ("Channel" FLOAT, "Video" CLOB, "Aspect" CLOB, "PSIP Short Name" CLOB, "Network" CLOB)

What network has an aspect of 4:3 and a PSIP Short Name of qvc?
SELECT "Network" FROM table_51512 WHERE "Aspect" = '4:3' AND "PSIP Short Name" = 'qvc'
SELECT "Network" FROM "table_51512" WHERE "Aspect" = '4:3' AND "PSIP Short Name" = 'qvc'