CREATE TABLE table_39144 ("FOURCC" CLOB, "DX 10 Name" CLOB, "Description" CLOB, "Alpha premultiplied?" CLOB, "Compression ratio" CLOB, "Texture Type" CLOB)

Which Compression ratio has a (none) DX 10 Name and a FOURCC of dxt4?
SELECT "Compression ratio" FROM table_39144 WHERE "DX 10 Name" = '(none)' AND "FOURCC" = 'dxt4'
SELECT "Compression ratio" FROM "table_39144" WHERE "DX 10 Name" = '(none)' AND "FOURCC" = 'dxt4'