CREATE TABLE table_204_638 (id NUMBER, "year" NUMBER, "tournament" CLOB, "surface" CLOB, "round" CLOB, "winner" CLOB, "score" CLOB)

did john mcenroe score at least 7 points i 'm the 1991 game
SELECT (SELECT "score" FROM table_204_638 WHERE "winner" = 'john mcenroe' AND "year" = 1991) >= 7
SELECT (SELECT "score" FROM "table_204_638" WHERE "winner" = 'john mcenroe' AND "year" = 1991) >= 7