user: Question: What is the career caps for Half-Back, when tests is more than 3?
Columns: ['Name', 'Tests', 'Club', 'Career caps', 'Tour Apps', 'Position']
Types: ['text', 'real', 'text', 'real', 'real', 'text']
Sample row: ['A.W. Ross', 5.0, 'Sydney University', 20.0, 29.0, 'Full Back']
SQL:

assistant: SELECT "Career caps" FROM "Table" WHERE "Position" = 'Half-Back' AND "Tests" > 3.0;