user: Question: How many times did a Center that attended Oral Roberts play for the Rockets?
Columns: ['Player', 'No.(s)', 'Height in Ft.', 'Position', 'Years for Rockets', 'School/Club Team/Country']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Abdul-Aziz, Zaid Zaid Abdul-Aziz', '6, 27, 35', '6-9', 'Forward', '1972-75, 1977-78', 'Iowa State']
SQL:

assistant: SELECT COUNT("Years for Rockets") FROM "Table" WHERE "Position" = 'Center' AND "School/Club Team/Country" = 'Oral Roberts';