CREATE TABLE table_6881 ("Date" CLOB, "Score" CLOB, "Set 1" CLOB, "Set 2" CLOB, "Set 3" CLOB, "Set 4" CLOB, "Set 5" CLOB, "Total" CLOB)

What is Set 1, when Set 4 is NA, when Score is 3-0, and when Set 2 is 29-27?
SELECT "Set 1" FROM table_6881 WHERE "Set 4" = 'na' AND "Score" = '3-0' AND "Set 2" = '29-27'
SELECT "Set 1" FROM "table_6881" WHERE "Score" = '3-0' AND "Set 2" = '29-27' AND "Set 4" = 'na'