Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_63 (win_percentage INTEGER, games_behind VARCHAR, wins VARCHAR)

### Question ###
What is the lowest percentage of wins for 6½ games and more than 77 total wins?

### Accurate SQL ###

SELECT MIN(win_percentage) FROM table_name_63 WHERE games_behind = "6½" AND wins > 77