user: Question: What is the portfolio attachment of the Undersecretary appointed at age 48 with a Chinese name of 梁鳳儀?
Columns: ['Romanised name', 'Chinese name', 'age at appointment', 'Foreign nationality', 'Portfolio attachment', 'Govt salary']
Types: ['text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Chen Wei-on, Kenneth', '陳維安', 43.0, 'N/A', 'Education', 'HK$223,585']
SQL:

assistant: SELECT "Portfolio attachment" FROM "Table" WHERE "age at appointment" = 48.0 AND "Chinese name" = '梁鳳儀';