CREATE TABLE table_51800 ("Date" CLOB, "Visitor" CLOB, "Score" CLOB, "Home" CLOB, "Decision" CLOB, "Attendance" FLOAT, "Series" CLOB)

Which series is based in Toronto on may 18?
SELECT "Series" FROM table_51800 WHERE "Home" = 'toronto' AND "Date" = 'may 18'
SELECT "Series" FROM "table_51800" WHERE "Date" = 'may 18' AND "Home" = 'toronto'