CREATE TABLE table_2571 ("Sigma level" FLOAT, "Sigma  ( with 1.5\\u03c3 shift ) " CLOB, "DPMO" CLOB, "Percent defective" CLOB, "Percentage yield" CLOB, "Short-term C pk" CLOB, "Long-term C pk" CLOB)

What is the percentage yield for a DPMO of 3.4?
SELECT "Percentage yield" FROM table_2571 WHERE "DPMO" = '3.4'
SELECT "Percentage yield" FROM "table_2571" WHERE "DPMO" = '3.4'