user: Question: What is the L2 Cache for Model Number Nano U3400 with an Idle Power of 100mW?
Columns: ['Model Number', 'Clock Speed', 'L1 Cache', 'L2 Cache', 'FSB Speed', 'Clock Multiplier', 'Idle Power', 'Socket', 'Cores', 'Release Date']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Nano L3050', '1.8 GHz', '64+64 KB', '1 MB', '800MHz', '18×', '500mW', 'NanoBGA2', 1.0, 'April 22, 2010']
SQL:

assistant: SELECT "L2 Cache" FROM "Table" WHERE "Idle Power" = '100mW' AND "Model Number" = 'Nano U3400';