CREATE TABLE table_4144 ("By-election" FLOAT, "Electorate" CLOB, "Date" CLOB, "Incumbent" CLOB, "Reason" CLOB, "Winner" CLOB)

When waikaia is the electorate what is the highest by-election?
SELECT MAX("By-election") FROM table_4144 WHERE "Electorate" = 'Waikaia'
SELECT MAX("By-election") FROM "table_4144" WHERE "Electorate" = 'Waikaia'