user: Question: When the % of boundary by water is 63% what is the overall number of zip code prefix(es)?
Columns: ['IN No.', 'County Name', 'Establishment Date (SW Indiana) (History) (Statehood)', 'County Seat', 'Time Zone', 'Population (2010) (Rank)', 'Area sq mi (km 2 ) (Rank)', 'Twps', 'ZIP code Prefix(es)', '% of Boundary by water']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: [14.0, 'Daviess', 'February 2, 1818 (10) (29) (14)', 'Washington', 'Eastern', '32,200 (6)', 'sqmi (km2) (3)', 10.0, '475', '55%']
SQL:

assistant: SELECT COUNT("ZIP code Prefix(es)") FROM "Table" WHERE "% of Boundary by water" = '63%';