user: Question: What is Population in Millions, when GDP 2012 Millions of Euro is 600,638?
Columns: ['s Member state', 'GDP 2012 millions of euro', 'Population in millions', 'GDP (PPP) per capita 2012 euro', 'GDP (Nominal) per capita 2012 euro', 'GDP (PPP) per capita 2012 EU27 = 100']
Types: ['text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['European Union', '12,899,149', 504.9, '25,500', '25,600', '100%']
SQL:

assistant: SELECT "Population in millions" FROM "Table" WHERE "GDP 2012 millions of euro" = '600,638';