When waikaia is the electorate what is the highest by-election?
CREATE TABLE table_28898948_3 (by_election INTEGER, electorate VARCHAR)
SELECT MAX(by_election) FROM table_28898948_3 WHERE electorate = "Waikaia"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_28898948_3 (by_election INTEGER, electorate VARCHAR) Question: When waikaia is the electorate what is the highest by-election? [/INST] SELECT MAX(by_election) FROM table_28898948_3 WHERE electorate = "Waikaia" </s>