CREATE TABLE table_1289762_1 (s_spoilt_vote INT, constituency VARCHAR)

List the smallest possible spoilt vote with the s r-tr ndelag constituency.
SELECT MIN(s_spoilt_vote) FROM table_1289762_1 WHERE constituency = "Sør-Trøndelag"
SELECT MIN("s_spoilt_vote") FROM "table_1289762_1" WHERE "Sør-Trøndelag" = "constituency"