CREATE TABLE table_17968229_1 (home__2nd_leg_ VARCHAR2)

If the home is Atl tico Tucum n, what is the name of the first leg?
SELECT 1 AS st_leg FROM table_17968229_1 WHERE home__2nd_leg_ = "Atlético Tucumán"
SELECT 1 AS "st_leg" FROM "table_17968229_1" WHERE "Atlético Tucumán" = "home__2nd_leg_"