user: Question: What is the code nickname where Steve Mayne is the coach?
Columns: ['Name', 'Nickname', 'First season', 'Location', 'Home ground(s)', 'Coach', 'Captain']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Bayswater-Morley District Cricket Club [a ]', 'Bears', '1933–34 (B2 and B3 Grades) 1947–48 (1st Grade)', 'Bayswater', 'Hillcrest Reserve', 'Craig Kirkby', 'Simon Allison']
SQL:

assistant: SELECT "Nickname" FROM "Table" WHERE "Coach" = 'Steve Mayne';