CREATE TABLE table_12977 ("Week 1" CLOB, "Week 2" CLOB, "Week 3" CLOB, "Week 4" CLOB, "Week 5" CLOB)

What Week 2 has a Week 4 of piret aava?
SELECT "Week 2" FROM table_12977 WHERE "Week 4" = 'piret aava'
SELECT "Week 2" FROM "table_12977" WHERE "Week 4" = 'piret aava'