CREATE TABLE table_203_138 (id NUMBER, "#" NUMBER, "date" CLOB, "venue" CLOB, "opponent" CLOB, "score" CLOB, "result" CLOB, "competition" CLOB)

how many times was liechtenstein the opponent ?
SELECT COUNT(DISTINCT "date") FROM table_203_138 WHERE "opponent" = 'liechtenstein'
SELECT COUNT(DISTINCT "date") FROM "table_203_138" WHERE "opponent" = 'liechtenstein'